import math
def sieve(n):
	p=[True for i in range(n+1)]
	p[0]=p[1]=False
	end=int(n**0.5)
	for i in range(2,end+1):
		if p[i]:
			for j in range(i*i,n+1,i):
				p[j]=False
	return p
p=sieve(10**7+10)
out="NO"
n=int(input())
for i in range(2,int(math.sqrt(n))+1):
	if n%i==0 and p[i]==0:
		out="YES"
		break
print(out)