#include <stdio.h>
#include <math.h>
#include <limits.h>

int main(void) {
	unsigned long long int i = 0;
	unsigned long int j = 0;
	unsigned char is_prime = 1;
	unsigned long long int n = 0;
	unsigned char fact_time = 0;

	scanf("%lld", &n);

	i = 1;
	while ( fact_time <= 2 ) {
		is_prime = 1;
		for ( i=(i+1); i<=sqrt(n); i++ ) {
			if ( !(n % i) ) {
				is_prime = 0;
				break;
			}
		}
		if ( is_prime ) {
			fact_time++;
			break;
		}
		while ( !(n % i) ) {
			n /= i;
			if ( fact_time < UCHAR_MAX )
				fact_time++;
		}
	}

	if ( fact_time > 2 ) {
		printf("YES\n");
	}
	else {
		printf("NO\n");
	}
	return 0;
}