#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,s=0; cin>>n; for(int i=2;i*i<n;i++){ if(n%i==0) cout<<"No"; return 0; } cout<<"Yes"; return 0; }