#include <bits/stdc++.h>
using namespace std;
bool primejudge(long long int N){
    long long int k = (long long int)powl(N,1/2);
    if(N == 1){
        return true;
    }else{
        for(int i=2;i<=k;i++){
            if(N % i == 0){
                return false;
            }
        }
        return true;
    }
}

int main(){
    long long int N;
    cin >> N;
    if(primejudge(N)) cout << "NO" << endl;
    else cout << "YES" << endl;
    return 0;
}