import sequtils,strutils,strscans,algorithm,math,future,macros
template get*():string = stdin.readLine()
let N = get().parseInt()
if N == 1 :
  echo "NO"
  quit()
import osproc
let
  p = execProcess("factor " & $N )
  factors = p.strip().split()[1..^1].map(parseInt)
if factors.len == 2:
  echo "NO"
else:
  echo "YES"