#include <stdio.h>

int main(void) {
	unsigned long long int n,i;
	scanf("%llu",&n);
	if(n == 1){printf("NO\n");return 0;}
	else if(!(n%2)){printf("YES\n");return 0;}
	for(i = 3;i*i <= n;i+=2){
		if(!(n%i)){printf("YES\n");return 0;}
	}
	printf("NO\n");
	return 0;
}