$\color{green}\texttt{A83507题解}$

$\huge\color{red}求赞！$

代码见下

#include<bits/stdc++.h>
using namespace std;
int n,num;
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++)if(n%i==0)num++;
    if(num==3)puts("YES");
    else puts("NO");
}