C Program to find whether a number is prime number or not.

Hey there!

Welcome to ClearUrDoubt.com.

In this post, we will look at a C program to find whether a given number is a prime number or not.

Prime Number: A number, which is divisible by only 1 and itself.


1, 2, 3, 5, 7, 11 and so on are prime numbers.


To find whether a number(let’s say “num”) is prime or not, we need to check the remainder when we divide the given number with numbers from 2 to num/2.

This can be achieved using Modulus operator(“%”) in C. This operator gives the remainder of the division expression.

10 % 3 = 1
11 % 3 = 2
12 % 3 = 0

Here is the C program:











Happy Learning! 🙂

Please leave a reply in case of any queries.

Leave a Reply

Your email address will not be published. Required fields are marked *