Quiz on Prime Numbers

What is a prime number?

• A number that has exactly two factors: 1 and itself

• A number that can be divided by any number

• A number that is even

• A number that ends in 5

Which of these numbers is prime?

• 15

• 23

• 9

• 12

What is the smallest prime number?

• 0

• 1

• 2

• 3

Which of these is NOT a prime number?

• 7

• 25

• 17

• 13

How many prime numbers are there between 1 and 10?

• 3

• 4

• 5

• 6

Which number is a factor of 15?

• 4

• 6

• 5

• 7

What is the next prime number after 7?

• 8

• 9

• 11

• 10

Which statement about prime numbers is true?

• All prime numbers are odd

• Prime numbers can be negative

• 2 is the only even prime number

• Prime numbers must end in 1

How many factors does a prime number have?

• 3

• 2

• 4

• 1

Which is the largest prime number under 20?

• 17

• 18

• 19

• 16