import sys; input = sys.stdin.buffer.readline sys.setrecursionlimit(10**7) from collections import defaultdict con = 10 ** 9 + 7; INF = float("inf") def getlist(): return list(map(int, input().split())) #処理内容 def main(): N = int(input()) if N == 1: print("NO") return n = int(N ** 0.5) for i in range(2, min(n + 1, N)): if N % i == 0: print("YES") return print("NO") if __name__ == '__main__': main()