#include <bits/stdc++.h>
using namespace std;
int n,i,z; 
int main(){
	cin>>n;
	for(i=2;i<n;i++){
		if(n%i==0){
			z++;
			cout<<i;
			break;
		} 
	}
	if(z==0) cout<<"Yes";
}

/**************************************************************
	Problem: 1061
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/