输出一个大于三的的整数n,判定它是否为素数

#include<stdio.h>

int main()
{
int n,i;
printf("please enter a integer number,n=?");
scanf("%d",&n);
for(i = 2;i <= n-1;i++)
{
if(n%i == 0)
{
break;
}
if(i > n)
{
printf("%d is not a prime number.\n",n);
}
else
{
printf("%d is a prime number.\n",n);
}
}
return 0;
}