let i = require('fs').readFileSync('/dev/stdin', 'utf8').split('\n')[0]
let d = 0
if (i % 2 == 0) d++
for (let c = 3; c*c < i; c+=2) {
  if (i % c == 0) {
    d++
    if (i % (c * c) == 0) {
      d++
      break
    }
  }
}
console.log(d > 1 ? 'YES' : 'NO')