#include<iostream>
using namespace std;
long n,i;
main()
{
	cin>>n;
	for(i=2;i*i<=n;i++)
	{
		int c=0;
		while(n%i==0)
		{
			c++;
			n/=i;
		}
		if(c>1)
		{
			cout<<"YES"<<endl;
			return 0;
		}
	}
	cout<<"NO"<<endl;
}