#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,i,s=0;
    cin>>n;
    for(i=2;i<n;i++){
        if(n%i==0){
            s=1;
            cout<<i;
            break;
        }
    }
    if(s==0) cout<<"Yes"; 
     
}
/**************************************************************
	Problem: 1061
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/