Untitled

#include <iostream>
using namespace std;
int main()
{
	int a, b, c;
	b = 0;
	cin >> a;
	c = a;
	if (a > 0 && a != 1)
	{
		for (int i = 1; i != a+1; i++)
		{
			if (c % i == 0)	b += 1;
		}
		if (b > 2)	cout << "No";
		else cout << "Yes";
	}
	else cout << "No";
}