There are numbers, having exactly two factors 1 and the number itself. Such number are 2, 3, 5, 7, 11, and so on. These numbers are prime numbers.

The numbers other than 1 whose only factors are 1 and the number itself are called **Prime numbers**.

There are numbers having more than two factors like 4, 6, 8, 9, 10 and so on. These numbers are composite numbers.

Numbers having more than two factors are called **Composite numbers**.