#include <iostream>
#include <math.h>
#include <vector>
using namespace std;

int main(void)
{
    long long n;
    cin >> n;
    if(n == 1) {
        cout << "NO" << endl;
        exit(0);
    }
    long long sh = sqrt(n);
    bool find = false;
    for(long long i = 2; i <= sh; i++) {
        if(n % i == 0) {
            if(find) {
                cout << "YES" << endl;
                exit(0);
            }
            if(n % (i * i) == 0 && n != i * i) {
                cout << "YES" << endl;
                exit(0);
            }
            find = true;
        }
    }
    cout << "NO" << endl;
    return 0;
}