prime number

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

int main()

{
    int i,num;
    int counter=0;
    clrscr();
   
    /* THIS TOOL WILL FIND OUT PRIME NUMBER*/

    while(1)
    {printf("Enter a number to find out weather its PRIME or not:");
     scanf("%d",&num);
     
     for(i=2;i<num;i++)
     {    if(num%i=0)
        counter++
     }
    if(counter!=0)
     printf("This not a PRIME !!");
    else
     printf("This is a PRIME number.");
    }
    getch();
    return 0;

}