/*
HDU2161 Primes
http://acm.hdu.edu.cn/showproblem.php?pid=2161
数论 水题
注意输入截止条件是n<=0
*/
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <vector>
#include <queue>
//#define test
using namespace std;
const int Nmax=;
int is_prime[Nmax];
void get()
{
for(int i=;i<Nmax;i++)
is_prime[i]=;
for(int i=;i<Nmax;i++)
{
if(is_prime[i])
{
for(int j=;j*i<Nmax;j++)
is_prime[i*j]=;
}
}
is_prime[]=;
}
int main()
{
#ifdef test
#endif
int n,t=;
get();
while(scanf("%d",&n)==)
{
if(n<=)
break;
t++;
printf("%d: ",t);
if(is_prime[n])
printf("yes\n");
else
printf("no\n");
} return ;
}

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