#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	int flag=0;
	for(int i=2;i<n;i++)
	{
	    if(n%i==0)
	    {
	    	cout<<i;
	    	flag=1;
	    	break;
		}
	} 
	if(flag!=1)
	{
		cout<<"Yes";
	}
	return 0;
}
/**************************************************************
	Problem: 1061
	User: chenkexin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/