package main

import . "fmt"

func main() {
	var n,c,x,m int64
	Scan(&n)
	for x,m=2,n;x*x<=m;x++ {
		if n%x!=0 {
			continue
		}
		c++
		for n%x==0 {
			n/=x
		}
	}
	if n>1 {
		c++
	}
	if c==2 {
		Println("Yes")
	} else {
		Println("No")
	}
}