import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = ni()

i = 2
a = 0
N = n
while i * i <= N:
    if n % i == 0:
        a += 1
        while n % i == 0:
            n //= i
    i += 1

if n != 1:
    a += 1
    
if a <= 2:
    Yes()
else:
    No()