#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: 15159808820
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/