#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main()
{
    ll N;
    cin >> N;
    int cnt = 0;
    for (ll i = 2; i * i <= N; i++)
    {
        if (N % i == 0)
        {
            cnt++;
            while (N % i == 0)
            {
                N /= i;
            }
        }
    }
    if (N > 1)
    {
        cnt++;
    }
    if (cnt <= 2)
    {
        cout << "Yes" << endl;
    }
    else
    {
        cout << "No" << endl;
    }
}