#include <iostream>

using namespace std;
int main() {
    int n;
    while (cin >> n) {
        if (n == 0) break;
        int i = 2;
        while (i * i <= n) {
            if (n % (i * i) == 0) {
                cout << "Yes" << endl;
                break;
            }
            i++;
        }
        if (i * i > n) {
            cout << "No" << endl;
        }
    }
}