Write If a Number is Prime or Composite

Name Grade School
Date Questions20 Score

1
is 33 a prime number?
2
is 21 a composite number?
3
is 39 a composite number?
4
is 25 a prime number?
5
is 21 a prime number?
6
is 19 a composite number?
7
is 111 a prime number?
8
is 157 a prime number?
9
is 119 a composite number?
10
is 23 a prime number?
11
is 27 a composite number?
12
is 143 a prime number?
13
is 343 a prime number?
14
is 37 a prime number?
15
is 3025 a prime number?
16
is 59 a composite number?
17
is 513 a composite number?
18
is 2 a composite number?
19
is 67 a composite number?
20
is 65 a composite number?

Answers Key
1
is 33 a prime number?
No, 33 is not a prime number as it has more than 2 factors.
1, 3, 11 and 33 are the factors of 33
2
is 21 a composite number?
Yes, 21 is a composite number as it has more than 2 factors.
1, 3, 7 and 21 are the factors of 21
3
is 39 a composite number?
Yes, 39 is a composite number as it has more than 2 factors.
1, 3, 13 and 39 are the factors of 39
4
is 25 a prime number?
No, 25 is not a prime number as it has more than 2 factors.
1, 5 and 25 are the factors of 25
5
is 21 a prime number?
No, 21 is not a prime number as it has more than 2 factors.
1, 3, 7 and 21 are the factors of 21
6
is 19 a composite number?
No, 19 is not a composite number as it has only 2 factors.
Factors of 19 = 1 and 19
7
is 111 a prime number?
No, 111 is not a prime number as it has more than 2 factors.
1, 3, 37 and 111 are the factors of 111
8
is 157 a prime number?
Yes, 157 is the prime number as it can be divisible by 1 and itself.
Factors of 157 = 1 and 157
9
is 119 a composite number?
Yes, 119 is a composite number as it has more than 2 factors.
1, 7, 17 and 119 are the factors of 119
10
is 23 a prime number?
Yes, 23 is the prime number as it can be divisible by 1 and itself.
Factors of 23 = 1 and 23
11
is 27 a composite number?
Yes, 27 is a composite number as it has more than 2 factors.
1, 3, 9 and 27 are the factors of 27
12
is 143 a prime number?
No, 143 is not a prime number as it has more than 2 factors.
1, 11, 13 and 143 are the factors of 143
13
is 343 a prime number?
No, 343 is not a prime number as it has more than 2 factors.
1, 7, 49 and 343 are the factors of 343
14
is 37 a prime number?
Yes, 37 is the prime number as it can be divisible by 1 and itself.
Factors of 37 = 1 and 37
15
is 3025 a prime number?
No, 3025 is not a prime number as it has more than 2 factors.
1, 5, 11, 25, 55, 121, 275, 605 and 3025 are the factors of 3025
16
is 59 a composite number?
No, 59 is not a composite number as it has only 2 factors.
Factors of 59 = 1 and 59
17
is 513 a composite number?
Yes, 513 is a composite number as it has more than 2 factors.
1, 3, 9, 19, 27, 57, 171 and 513 are the factors of 513
18
is 2 a composite number?
No, 2 is not a composite number as it has only 2 factors.
Factors of 2 = 1 and 2
19
is 67 a composite number?
No, 67 is not a composite number as it has only 2 factors.
Factors of 67 = 1 and 67
20
is 65 a composite number?
Yes, 65 is a composite number as it has more than 2 factors.
1, 5, 13 and 65 are the factors of 65

Determine If a Number is Prime or Composite Worksheet

Prime and composite numbers worksheet with answers to practice & learn 6th grade math problems is available online for free in printable & downloadable (pdf & image) format. Tap on PRINT, PDF or IMAGE button to print or download this grade-6 divisors and factors worksheets to practice writing if a number is prime or composite.

How to Use this Worksheet

In this sixth grade divisors and factors worksheet, students are required to determine if the given number is prime or composite. The number is which is divisible by 1 and itself is called Prime Number. The number which is the factor of multiple prime numbers is called Composite Number. The numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 are the list of prime numbers under 100.

Answers Key

Teachers, tutors, parents or students can check or validate the solved questions by using the corresponding answers key which comprises the step by step work on how to determine if a number is composite or prime.

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