c语言程序

#include<stdio.h>
int main(void)
{
 int i,m;
 printf("Enter a number;");
 scanf("%d",&m);
 for(i = 2;i <=m-1;i++)
  if(m % i == 0)
   break;
  if(i>m/2 && m!=1)
   printf("%d is a prime number!\n",m);
  else
   printf("No!\n");
  return 0;

}