Prime or Composite Numbers

Front

Which number below is NOT prime? 3, 7, 9, 11

Back

9 is NOT a prime number because it has factors other than 1 and itself (1, 3, 9).

Front

Which number below is NOT prime? 2, 11, 13, 18

Back

18 is NOT a prime number because it has factors other than 1 and itself (1, 2, 3, 6, 9, 18).

Front

A number that has only two factors, 1 and itself, is called a _______ number.

Back

prime

Front

Is 21 prime or composite?

Back

Composite

Front

Is 31 prime or composite?

Back

Prime

Front

What is a composite number?

Back

A composite number is a number that has more than two factors.

Front

What is a prime number?

Back

A prime number is a number greater than 1 that has no positive divisors other than 1 and itself.

Front

List the first five prime numbers.

Back

2, 3, 5, 7, 11.

Front

Is 1 a prime number?

Back

No, 1 is NOT a prime number because it does not have exactly two distinct positive divisors.

Front

What is the smallest prime number?

Back

The smallest prime number is 2.