import std.algorithm, std.array, std.container, std.range;
import std.string, std.conv, std.math;
import std.stdio, std.typecons;

void main()
{
  auto n = readln.chomp.to!long;

  auto max = sqrt(n.to!real).to!int;
  auto pi = primes(max);

  auto r = pi.any!(p => n % p == 0 && !pi.canFind(n / p));

  writeln(r ? "YES" : "NO");
}

int[] primes(int n)
{
  auto sieve = new bool[n + 1];
  sieve.fill(true);

  auto max = sqrt(n.to!real).to!int;
  for (auto p = 2; p <= max; ++p)
    if (sieve[p])
      for (auto q = p * 2; q <= n; q += p)
        sieve[q] = false;

  int[] r;
  for (auto p = 2; p <= n; ++p)
    if (sieve[p])
      r ~= p;

  return r;
}