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2 <p>Last updated on<strong>August 5, 2025</strong></p>

3 <p>The numbers that have only two factors, which are 1 and itself, are called prime numbers. Prime numbers are used in encryption, computer algorithms, and barcode generation. In this topic, we will be discussing whether 120 is a prime number or not.</p>

4 <h2>Is 120 a Prime Number?</h2>

5 <p>There are two<a>types of numbers</a>, mostly -</p>

6 <p><a>prime numbers</a>and<a>composite numbers</a>, depending on the number of<a>factors</a>.</p>

7 <p>A prime number is a<a>natural number</a>that is divisible only by 1 and itself.</p>

8 <p>For example, 3 is a prime number because it is divisible by 1 and itself.</p>

9 <p>A composite number is a positive number that is divisible by more than two numbers.</p>

10 <p>For example, 6 is divisible by 1, 2, 3, and 6, making it a composite number.</p>

11 <p>Prime numbers follow a few properties like: </p>

12 <ul><li>Prime numbers are positive numbers always<a>greater than</a>1. </li>

13 <li>2 is the only even prime number. </li>

14 <li>They have only two factors: 1 and the number itself. </li>

15 <li>Any two distinct prime numbers are<a>co-prime numbers</a>because they have only one common factor that is 1. </li>

16 </ul><p>As 120 has more than two factors, it is not a prime number.</p>

17 <h2>Why is 120 Not a Prime Number?</h2>

18 <p>The characteristic<a>of</a>a prime number is that it has only two divisors: 1 and itself.</p>

19 <p>Since 120 has more than two factors, it is not a prime number.</p>

20 <p>A few methods are used to distinguish between prime and composite numbers: </p>

21 <ul><li>Counting Divisors Method </li>

22 <li>Divisibility Test </li>

23 <li>Prime Number Chart </li>

24 <li>Prime Factorization</li>

25 </ul><h3>Using the Counting Divisors Method</h3>

26 <p>The method in which we count the number of divisors to categorize the numbers as prime or composite is called the counting divisors method. Based on the count of the divisors, we categorize prime and composite numbers. - If there is a total count of only 2 divisors, then the number would be prime. If the count is more than 2, then the number is composite. Let’s check whether 120 is prime or composite.</p>

27 <p><strong>Step 1:</strong>All numbers are divisible by 1 and itself.</p>

28 <p><strong>Step 2:</strong>Divide 120 by 2. It is divisible by 2, so 2 is a factor of 120.</p>

29 <p><strong>Step 3:</strong>Divide 120 by 3. It is divisible by 3, so 3 is a factor of 120.</p>

30 <p><strong>Step 4:</strong>You can simplify checking divisors up to 120 by finding the root value. We then need to only check divisors up to the root value.</p>

31 <p><strong>Step 5:</strong>When we divide 120 by 4, 5, and 6, it is divisible by all.</p>

32 <p>Since 120 has more than 2 divisors, it is a composite number.</p>

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35 <h3>Using the Divisibility Test Method</h3>

34 <h3>Using the Divisibility Test Method</h3>

36 <p>We use a<a>set</a>of rules to check whether a number is divisible by another number completely or not. It is called the Divisibility Test Method. </p>

35 <p>We use a<a>set</a>of rules to check whether a number is divisible by another number completely or not. It is called the Divisibility Test Method. </p>

37 <p><strong>Divisibility by 2:</strong>The number in the ones'<a>place value</a>is 0, which is an<a>even number</a>, meaning that 120 is divisible by 2. </p>

36 <p><strong>Divisibility by 2:</strong>The number in the ones'<a>place value</a>is 0, which is an<a>even number</a>, meaning that 120 is divisible by 2. </p>

38 <p><strong>Divisibility by 3:</strong>The<a>sum</a>of the digits in the number 120 is 3. Since 3 is divisible by 3, 120 is also divisible by 3.</p>

37 <p><strong>Divisibility by 3:</strong>The<a>sum</a>of the digits in the number 120 is 3. Since 3 is divisible by 3, 120 is also divisible by 3.</p>

39 <p><strong>Divisibility by 5:</strong>The unit’s place digit is 0. Therefore, 120 is divisible by 5. </p>

38 <p><strong>Divisibility by 5:</strong>The unit’s place digit is 0. Therefore, 120 is divisible by 5. </p>

40 <p><strong>Divisibility by 7:</strong>The last digit in 120 is 0. To check divisibility by 7, double the last digit (0 × 2 = 0). Then, subtract it from the rest of the number (12 - 0 = 12). Since 12 is not divisible by 7, 120 is also not divisible by 7. </p>

39 <p><strong>Divisibility by 7:</strong>The last digit in 120 is 0. To check divisibility by 7, double the last digit (0 × 2 = 0). Then, subtract it from the rest of the number (12 - 0 = 12). Since 12 is not divisible by 7, 120 is also not divisible by 7. </p>

41 <p><strong>Divisibility by 11:</strong>In 120, the sum of the digits in odd positions is 3, and the sum of the digits in even positions is 0. This means that 120 is not divisible by 11. Since 120 is divisible by 2, 3, and 5, it has more than two factors.</p>

40 <p><strong>Divisibility by 11:</strong>In 120, the sum of the digits in odd positions is 3, and the sum of the digits in even positions is 0. This means that 120 is not divisible by 11. Since 120 is divisible by 2, 3, and 5, it has more than two factors.</p>

42 <p>Therefore, it is a composite number.</p>

41 <p>Therefore, it is a composite number.</p>

43 <h3>Using Prime Number Chart</h3>

42 <h3>Using Prime Number Chart</h3>

44 <p>The prime number chart is a tool created by using a method called “The Sieve of Eratosthenes.” In this method, we follow the following steps:</p>

43 <p>The prime number chart is a tool created by using a method called “The Sieve of Eratosthenes.” In this method, we follow the following steps:</p>

45 <p><strong>Step 1:</strong>Write 1 to 100 in 10 rows and 10 columns.</p>

44 <p><strong>Step 1:</strong>Write 1 to 100 in 10 rows and 10 columns.</p>

46 <p><strong>Step 2:</strong>Leave 1 without coloring or crossing, as it is neither prime nor composite.</p>

45 <p><strong>Step 2:</strong>Leave 1 without coloring or crossing, as it is neither prime nor composite.</p>

47 <p><strong>Step 3:</strong>Mark 2 because it is a prime number and cross out all the<a>multiples</a>of 2.</p>

46 <p><strong>Step 3:</strong>Mark 2 because it is a prime number and cross out all the<a>multiples</a>of 2.</p>

48 <p><strong>Step 4:</strong>Mark 3 because it is a prime number and cross out all the multiples of 3.</p>

47 <p><strong>Step 4:</strong>Mark 3 because it is a prime number and cross out all the multiples of 3.</p>

49 <p><strong>Step 5:</strong>Repeat this process until you reach the table consisting of marked and crossed boxes, except 1. Through this process, we will have a list of prime numbers from 1 to 100. The list is 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.</p>

48 <p><strong>Step 5:</strong>Repeat this process until you reach the table consisting of marked and crossed boxes, except 1. Through this process, we will have a list of prime numbers from 1 to 100. The list is 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.</p>

50 <p>120 is not present in the list of prime numbers, so it is a composite number.</p>

49 <p>120 is not present in the list of prime numbers, so it is a composite number.</p>

51 <h3>Using the Prime Factorization Method</h3>

50 <h3>Using the Prime Factorization Method</h3>

52 <p>Prime factorization is a process of breaking down a number into<a>prime factors</a>. Then multiply those factors to obtain the original number.</p>

51 <p>Prime factorization is a process of breaking down a number into<a>prime factors</a>. Then multiply those factors to obtain the original number.</p>

53 <p><strong>Step 1:</strong>We can write 120 as 2 × 60.</p>

52 <p><strong>Step 1:</strong>We can write 120 as 2 × 60.</p>

54 <p><strong>Step 2:</strong>In 2 × 60, 60 is a composite number. Further, break the 60 into 2 × 30.</p>

53 <p><strong>Step 2:</strong>In 2 × 60, 60 is a composite number. Further, break the 60 into 2 × 30.</p>

55 <p><strong>Step 3:</strong>Now, break down 30 into 2 × 15 and 15 into 3 × 5. Now we get the<a>product</a>consisting of only prime numbers.</p>

54 <p><strong>Step 3:</strong>Now, break down 30 into 2 × 15 and 15 into 3 × 5. Now we get the<a>product</a>consisting of only prime numbers.</p>

56 <p>Hence, the prime factorization of 120 is 2 × 2 × 2 × 3 × 5.</p>

55 <p>Hence, the prime factorization of 120 is 2 × 2 × 2 × 3 × 5.</p>

57 <h2>Common Mistakes to Avoid When Determining if 120 is Not a Prime Number</h2>

56 <h2>Common Mistakes to Avoid When Determining if 120 is Not a Prime Number</h2>

58 <p>Children might have some misconceptions about prime numbers when they are learning about them. Here are some mistakes that might be made by children.</p>

57 <p>Children might have some misconceptions about prime numbers when they are learning about them. Here are some mistakes that might be made by children.</p>

59 <h2>FAQ on Is 120 a Prime Number?</h2>

58 <h2>FAQ on Is 120 a Prime Number?</h2>

60 <h3>1.Is 120 a perfect square?</h3>

59 <h3>1.Is 120 a perfect square?</h3>

61 <h3>2.What is the sum of the divisors of 120?</h3>

60 <h3>2.What is the sum of the divisors of 120?</h3>

62 <p>The sum of the divisors of 120 is 360.</p>

61 <p>The sum of the divisors of 120 is 360.</p>

63 <h3>3.What are the factors of 120?</h3>

62 <h3>3.What are the factors of 120?</h3>

64 <p>120 is divisible by 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120, making these numbers the factors.</p>

63 <p>120 is divisible by 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, and 120, making these numbers the factors.</p>

65 <h3>4.What are the closest prime numbers to 120?</h3>

64 <h3>4.What are the closest prime numbers to 120?</h3>

66 <p>113 and 127 are the closest prime numbers to 120.</p>

65 <p>113 and 127 are the closest prime numbers to 120.</p>

67 <h3>5.What is the prime factorization of 120?</h3>

66 <h3>5.What is the prime factorization of 120?</h3>

68 <p>The prime factorization of 120 is 2 × 2 × 2 × 3 × 5.</p>

67 <p>The prime factorization of 120 is 2 × 2 × 2 × 3 × 5.</p>

69 <h2>Important Glossaries for "Is 120 a Prime Number"</h2>

68 <h2>Important Glossaries for "Is 120 a Prime Number"</h2>

70 <ul><li><strong>Composite numbers:</strong>Natural numbers greater than 1 that are divisible by more than 2 numbers are called composite numbers. For example, 12 is a composite number because 12 is divisible by 1, 2, 3, 4, 6, and 12.</li>

69 <ul><li><strong>Composite numbers:</strong>Natural numbers greater than 1 that are divisible by more than 2 numbers are called composite numbers. For example, 12 is a composite number because 12 is divisible by 1, 2, 3, 4, 6, and 12.</li>

71 </ul><ul><li><strong>Prime factorization:</strong>The process of breaking down a number into its prime factors.</li>

70 </ul><ul><li><strong>Prime factorization:</strong>The process of breaking down a number into its prime factors.</li>

72 </ul><ul><li><strong>Divisibility rules:</strong>A set of rules to determine if one number is divisible by another without actually performing division.</li>

71 </ul><ul><li><strong>Divisibility rules:</strong>A set of rules to determine if one number is divisible by another without actually performing division.</li>

73 </ul><ul><li><strong>Co-prime numbers:</strong>Two numbers that have only one common factor, which is 1.</li>

72 </ul><ul><li><strong>Co-prime numbers:</strong>Two numbers that have only one common factor, which is 1.</li>

74 <li><strong>Perfect square:</strong>A number that can be expressed as the product of an integer with itself, such as 16 (4 × 4).</li>

73 <li><strong>Perfect square:</strong>A number that can be expressed as the product of an integer with itself, such as 16 (4 × 4).</li>

75 </ul><p>What Are Prime Numbers? 🔢✨ | Easy Tricks & 🎯 Fun Learning for Kids | ✨BrightCHAMPS Math</p>

74 </ul><p>What Are Prime Numbers? 🔢✨ | Easy Tricks & 🎯 Fun Learning for Kids | ✨BrightCHAMPS Math</p>

76 <p>▶</p>

75 <p>▶</p>

77 <h2>Hiralee Lalitkumar Makwana</h2>

76 <h2>Hiralee Lalitkumar Makwana</h2>

78 <h3>About the Author</h3>

77 <h3>About the Author</h3>

79 <p>Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.</p>

78 <p>Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.</p>

80 <h3>Fun Fact</h3>

79 <h3>Fun Fact</h3>

81 <p>: She loves to read number jokes and games.</p>

80 <p>: She loves to read number jokes and games.</p>