import math

N = int(input())

d = [x for x in range(2, int(math.sqrt(N))+1) if N % x == 0]

if len(d) > 1:
    print("YES")
elif (len(d) == 1 and
      N % d[0] ** 2 == 0 and
      N != d[0] ** 2):
    print("YES")
else:
    print("NO")