C Program to find the number is a Prime Number or Not

#include<stdio.h>
#include<conio.h>
void main()
{
  int num,i;
  clrscr();
  printf("Enter the number = ");
  scanf("%d",&num);
  i=2;
  while (i<=num-1)
	{
		if (num%i==0)
			{
				printf("%d is not a prime number",num);
				break;
			}
		i++;
	}
		if (i==num)
			{
				printf("%d is a Prime Number",num);
			}
   getch();

}