C Programs to Check Prime Number

      This C program to check Prime number or Not. Prime number means those number to divided by itself or 1 like as 5, 7, 11.


C program code

#include<stdio.h>
#include<conio.h>

void main()
{
   int n, i, a = 2;
   clrscr();
   printf("\n Enter the number of check prime numbers ");
   scanf("%d",&n);
   for ( i = 2 ; i <= n - 1 ; i++ )
      {
         if ( n%i == 0 )
         {
              a++;
              break;
          }
       }
      if ( a == 2 )
         printf("\n %d number is prime.",n);
      else
         printf("\n %d number is not a prime.",n);
  getch();
}


Output:-
                   

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