C Program to Check Whether a given Number is Prime or Not

In this example, we will check whether a given number is Prime or Not. To solve this problem we should know about Prime Numbers.

What is a Prime Number?

Prime Numbers are those numbers which can only be divisible by 1 and the number itself.

For Example: 2,3,5,7,etc are prime numbers, as these numbes are only divisible by 1 and the number itself.

PROGRAM:

#include<stdio.h>
#include<conio.h>
int main()
{
    int x,i,count=0;
    printf("\nEnter the number : ");
    scanf("%d",&x);
    for(i=1;i<=x;i++)
    {
        if(x%i==0)
            count++;
    }
    if(count==2)
    {
        printf("\n%d is a Prime Number",x);
    }
    else
    {
        printf("\n%d is Not a Prime Number",x);
    }
}

OUTPUT:

Enter the number : 5

5 is a Prime Number

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