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

int main(){
    long long n;
    cin >> n;
    bool flag = true;
    if (n < 2) flag = false;
    for (long long i = 2; i * i <= n; i++){
        if (n % i == 0)
        {
            flag = false;
            break;
        }
    }
    if (flag)
        cout << "Yes";
    else{
        for (long long i = 2; i * i <= n; i++){
            if (n % i == 0){
                cout<<i<<endl;
                break;
            }
        }
    }
    return 0;
}

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

int main(){ long long n; cin >> n; bool flag = true; if (n < 2) flag = false; for (long long i = 2; i * i <= n; i++){ if (n % i == 0) { flag = false; break; } } if (flag) cout << "Yes"; else{ for (long long i = 2; i * i <= n; i++){ if (n % i == 0){ cout<<i<<endl; break; } } } return 0; }