What is natural numbers | Definition, Prime & Even Numbers

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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, ....... }

Type of Natural numbers 

1. Prime numbers 
2. Composite numbers

 1. Prime 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. 

2. Composite numbers

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


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