#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    int factor =0;
    cin >> n;

    for (int i = 2;i<=sqrt(n);i++)
    {
        if(n % i ==0) 
        {
            factor =i;
            break;
        }
    }
    if (factor !=0) cout <<factor;
    else cout <<"Yes";



    return 0;
}
/**************************************************************
	Problem: 1061
	User: mariooo
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/