"简简单单"

点个赞吧,求求了!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

#include<iostream>
using namespace std;
int main(){
    long long n;
    cin>>n;
    if(n<=1){
        cout<<"No";
        return 0;
    }
    for(long long i=2;i<n;i++){
        if(n%i==0){
            cout<<"No";
            return 0;
        }
    }
    cout<<"Yes";
    return 0;
}