#include<bits/stdc++.h> using namespace std; int main() { int n; cin >> n; int flag = 1; for (int i = 2; i < n ; i++) { if (n % i == 0) { flag = 0; break; } } if (flag == 0) { cout << "No" << endl; } else { cout << "Yes" << endl; } return 0; }