#include <iostream>
#include <string>
#include <vector>
#include <set>
#include <cmath>
#include <stack>
#include <algorithm>
#include <iomanip>
#include <map>
#include <queue>
#include <functional>
#include <numeric>
#include <chrono>
using ll = long long;
using namespace std;

const ll MOD = 1e9 + 7;
#define REP(i, n) for (int(i) = 0; (i) < (n); ++(i))
#define repi(i, a, b) for (int i = int(a); i < int(b); ++i)
// bool operator<(const pair<int, int> &a, const pair<int, int> &b)
// {
//     if (a.first == b.first)
//         return a.second < b.second;
//     return a.first < b.first;
// };

/*unsigned int xor128(void)
{
    static unsigned int x = 123456789, y = 362436069, z = 521288629, w = 88675123;
    unsigned int t = (x ^ (x << 11));
    x = y;
    y = z;
    z = w;
    return (w = (w ^ (w >> 19)) ^ (t ^ (t >> 8)));
}
unsigned int xor128rnd(unsigned int m)
{
    return xor128() % m;
}*/

bool sieve[10000010];

int main(void)
{
    ll N;
    cin >> N;

    if (N == 1)
    {
        cout << "NO" << endl;
        return 0;
    }
    REP(i, 10000010)
    {
        sieve[i] = true;
    }

    sieve[0] = sieve[1] = false;
    for (int i = 2; i * i < 10000010; ++i)
    {
        if (sieve[i])
        {
            for (int j = 2; i * j < 10000010; ++j)
            {
                sieve[i * j] = false;
            }
        }
    }

    int divp = 0;

    for (ll i = 2; i * i <= N; ++i)
    {
        if (N % i == 0)
        {
            if (sieve[i])
                divp++;
            else
            {
                cout << "YES" << endl;
                return 0;
            }
        }

        if (divp == 2)
        {
            cout << "YES" << endl;
            return 0;
        }
    }

    cout << "NO" << endl;
    return 0;
}