andy6804tw
10/12/2016 - 2:18 AM

http://e-tutor.itsa.org.tw/e-Tutor/mod/programming/view.php?id=30752

#include<stdio.h>    
int main(){       
    int n,i;  
    scanf("%d",&n);  
    for(i=2;i<n;i++)  
        if(n%i==0)break;  
    if(i==n||i==0)printf("YES\n");  
    else printf("NO\n");  
}