C Program to Check Whether a Number Is Prime [Easy Methods]
Briefly

A natural number is said to be prime if it is only divisible by itself and 1... the number itself.
A prime number can be written as a product of only two numbers... 3 can be written as 1 * 3.
8 which is a composite number can be written as 1 * 8 and 2 * 4.
The following diagrammatic illustration shows the prime numbers between 1 and 100... find some interesting facts about prime numbers.
Read at Simplilearn.com
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