#include <iostream>

using namespace std;

long long N;

int main() {
	cin >> N;
	for (long long d = 2; d * d <= N; d++) {
		int cnt = 0;
		while (N % d == 0) {
			cnt++;
			N /= d;
		}
		if (cnt > 0) {
			if (cnt > 2) {
				cout << "YES" << endl;
			} else if (cnt == 2) {
				if (N > 1) {
					cout << "YES" << endl;
				} else {
					cout << "NO" << endl;
				}
			} else if (cnt == 1) {
				cout << "YES" << endl;
			}
			return 0;
		}
	}
	cout << "NO" << endl;
	return 0;
}