Prime numbers under 10,000

A prime number is a whole number greater than one (1) that cannot be divided by any whole number except itself and the number 1.

A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. The smallest composite number is 4, because 2 x 2 = 4. 1 is not a composite number.