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# Prime and Composite Numbers

## What are Prime Numbers?

Prime Numbers are numbers which can only be divided by number 1 and that number itself.

# Rule:

Prime Numbers always have only 2 factors.

They are;

# 2 x 1 = 2

The factors of 2 are number 1 and 2 itself. Therefore 2 is a Prime Number.

# 2 x 2 = 4

The factors of 4 are number 1 , 2  and itself. 4 has three factors.

Therefore 4 is not a ‘Prime Number’, it is a ‘Composite Number’.

## 2 , 3 , 5 , 7 , 11 , 13 , 17, 19

You can clearly see in the table, that these numbers have only 2 factors.

They are always;

# The number itself

Therefore such numbers are called ‘Prime Numbers’.

### All the other numbers in the table have more than two factors, except number 1.

Therefore numbers with more than two factors are called ‘Composite Numbers’.

## Then what about number 1? Is it Prime or Composite?

* 1 has only one factor which is 1. Therefore it is neither Prime nor Composite.