What is natural numbers | Definition, Prime & Even Numbers

Natural Numbers

Counting numbers are known as natural numbers.

It is denoted by "N"

N = { 1,2,3,4,5,6,7,8,9,10,11,12,13, ....... }

1. Prime numbers

2. Composite numbers

A number which have only two prime factor, it is called a prime numbers. It is denoted by "P".

P = { 2,3,5,7,11,13,17,19, ....... }

e.g. "2" have two factors 1 and itself .

Similarly some other examples written below :

3 -> 1 and 3

5 -> 1 and 5

7 -> 1 and 7

11 -> 1 and 11 etc.

A numbers which have more than two factors, it is called a composite numbers.

{ 4,6,8,9,10,12,14,15,16,18, ...... }

e.g. "4" have more than two factors 1, 2 and 4

Similarly some other examples written below :

6 -> 1, 2, 3 and 6

8 -> 1, 2, 4 and 8

10 -> 1, 2, 5 and 10

12 -> 1, 2, 3, 4, 6 and 12 etc.

Note : " 1" is neither prime nor composite

We can understand numbers from a picture