def xxx(N):
	cn=0
	while N%2==0:
		N /=2
		cn+=1
		if cn>2:	return 1
	if N<2:			return 0
	M=int(N**0.5)+1
	for i in range(3,M,2):
		while N%i==0:
			N /=i
			cn+=1
			if cn>2:	return 1
	return cn==2 and N>1

N=int(input())
print(["NO","YES"][xxx(N)])