A *prime number* is a whole *number* greater than 1 whose only factors are 1 and itself. A factor is a whole *numbers* that can be divided evenly into another *number*. The first few *prime numbers* are 2, 3, 5, 7, 11, 13, 17 and 19.

Don’t forget 1 is not a *prime number* because 1 only has one factor – itself!