def factors(n):
    f = []

    c = 0
    while n % 2 == 0:
        n //= 2
        c += 1
    if c > 0:
        f.append([2, c])

    p = 3
    while p * p <= n:
        c = 0
        while n % p == 0:
            n //= p
            c += 1
        if c > 0:
            f.append([p, c])
        p += 2
    if n != 1:
        f.append([n, 1])

    return f

N = int(input())

f = factors(N)

yes = not(len(f)==0 or (len(f)==1 and f[0][1]==2) or (len(f)<=2 and all(x==1 for _,x in f)))

print('YES' if yes else 'NO')