A number with exactly two factors: 1 and itself.

A number that is always even.

A number that can be divided by numbers other than 1 and itself.

A number with more than two factors.

6

4

3

9

By finding more than two factors.

By using only multiplication.

By checking if it can be divided evenly only by 1 and itself.

By adding the number to itself.

Check if it has more than two factors.

Multiply it by itself.

Divide it by two and check for a remainder.

Add it to a known prime number.

It has exactly two factors.

It is always an odd number.

It has more than two factors.

It is divisible by only two numbers.