Prime or Composite Numbers? Numbers 0-20

Question 1

Is 0 a prime number?

Answer 1

No, the factors are 1, 2, 3 , 4 , 5 ,6 etc.

Question 2

Is 1 a prime number?

Answer 2

No, there is only one factor which is 1 itself.

Question 3

Is 2 a prime number?

Answer 3

Yes, as there are 2 factors which are 1, 2

Question 4

Is 3 a prime number?

Answer 4

Yes, as there are 2 factors which are 1, 3

Question 5

Is 4 a prime number?

Answer 5

No, there are 3 factors which are 1, 2 , 4

Question 6

Is 5 a prime number?

Answer 6

Yes, as there are 2 factors which are 1, 5

Question 7

Is 6 a prime number?

Answer 7

No, there are 4 factors which are 1, 2, 4, 6

Question 8

Is 7 a prime number?

Answer 8

Yes, as there are 2 factors which are 1, 7

Question 9

Is 8 a prime number?

Answer 9

No, there are 4 factors which are 1, 2 , 4, 8

Question 10

Is 9 a prime number?

Answer 10

No, there are 3 factors which are 1, 3, 9

Question 11

Is 10 a prime number?

Answer 11

No, there are 4 factors which are 1, 2, 5, 10

Question 12

Is 11 a prime number?

Answer 12

Yes, as there are 2 factors which are 1, 11

Question 13

Is 12 a prime number?

Answer 13

No, there are 6 factors which are 1, 2, 3, 4, 6, 12

Question 14

Is 13 a prime number?

Answer 14

Yes, as there are 2 factors which are 1, 13

Question 15

Is 14 a prime number?

Answer 15

No, there are 4 factors which are 1, 2, 7, 14

Question 16

Is 15 a prime number?

Answer 16

No, there are 4 factors which are 1, 3, 5, 15

Question 17

Is 16 a prime number?

Answer 17

No, there are 5 factors which are 1, 2, 4, 8, 16

Question 18

Is 17 a prime number?

Answer 18

Yes, as there are 2 factors which are 1, 17

Question 19

Is 18 a prime number?

Answer 19

No, there are 6 factors which are 1, 2, 3, 6, 9, 18

Question 20

Is 19 a prime number?

Answer 20

Yes, as there are 2 factors which are 1, 19

Question 21

Is 20 a prime number?

Answer 21

No, there are 6 factors which are 1, 2, 4, 5, 10, 20