# Prime number or not a Prime number using Python programming language.

By Shaik Jilani

To find whether the entered number is a Prime Number or not a Prime Number using the Python programming language.

*Prime numbers:*

A Counting number is known as a prime number if it has exactly two factors and the factors are one and number itself.

Ex: Prime numbers less than 100 are:2,3,5,7,11,13,17,19,23,29,31,37,4,4,47,53,59,61,67,71,73,79,83,89,97.

### Test whether a number is prime or not:

Let us consider x to be a given number and y to be the smallest counting number such that y^2 >= x.

Now, test whether x is divisible by any prime numbers less than or equal to y.

If it is divisible, then x is a prime number. Otherwise, it is not a prime number.

### Explanation of code:

Firstly, we take a number as input after_that we check if the number is less than or equal to 1, it is not a prime number. If it is not greater than 1, then it is not a prime number. If it is greater than 1, we check if the number is divisible by any number from 2 to (number/2)+1. If we find any factor in that range, then it is not a prime number. Otherwise, it is a prime number.

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