/************************************************

* Author        :Running_Time!

* Created Time  :2015-8-25 8:49:59

* File Name     :A.cpp

 ************************************************/

#include <cstdio>

#include <algorithm>

#include <iostream>

#include <sstream>

#include <cstring>

#include <cmath>

#include <string>

#include <vector>

#include <queue>

#include <deque>

#include <stack>

#include <list>

#include <map>

#include <set>

#include <bitset>

#include <cstdlib>

#include <ctime>

using namespace std;

#define lson l, mid, rt << 1

#define rson mid + 1, r, rt << 1 | 1

typedef long long ll;

const int MAXN = 1e5 + 10;

const int INF = 0x3f3f3f3f;

const int MOD = 1e9 + 7;

ll GCD(ll a, ll b)	{

	return b == 0 ? a : GCD (b, a % b);

}

int main(){

    int T, cas = 0;	scanf ("%d", &T);

    ll A, B, C;

    while (T--)	{

		scanf ("%I64d%I64d", &A, &B);

		while ((C = GCD (A, B)) != 1)   A /= C;

		printf ("Case #%d: %s\n", ++cas, A == 1 ? "YES" : "NO");

    }

    return 0;

}