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