Which of the following numbers is a prime number?

• 15

• 11

• 12

• 9

What is the only even prime number?

• 6

• 2

• 4

• 1

Which of the following is NOT a prime number?

• 9

• 7

• 13

• 5

Which of these numbers is prime?

• 21

• 33

• 25

• 17

How many prime numbers are there between 1 and 10?

• 5

• 4

• 3

• 2

Which of the following is a factor of 24?

• 9

• 7

• 5

• 6

What are the factors of 15?

• 1, 3, 5, 15

• 1, 5, 10, 15

• 1, 2, 5, 15

• 2, 3, 5, 15

Which of the following numbers has exactly two factors?

• 7

• 12

• 8

• 6

What is the greatest factor of 18?

• 18

• 12

• 6

• 9

Which of the following is a factor of 30?

• 9

• 8

• 6

• 4