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

int main(void) {
    long long n;
    cin >> n;
    long long N=n;
    int cnt=0;
    if(n%2==0){
        ++cnt;
        while(n%2==0){
            n/=2;
        }
    }
    for(long long i=3;i*i<=N;i+=2){
        if(n%i==0){
            ++cnt;
            while(n%i==0){
                n/=i;
            }
        }
    }
    if(cnt>=0 && cnt<2){
        cout << "Yes" << endl;
    } else if(cnt==2 && n==1){
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }
    return 0;
}