#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;

    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) {
            cout << i << endl;
            return 0;
        }
    }

    cout << "Yes" << endl;
    return 0;
}
/**************************************************************
	Problem: 1061
	User: fandaohan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/