local mfl, mce = math.floor, math.ceil
local function getprimes(x)
  local primes = {}
  local allnums = {}
  for i = 1, x do allnums[i] = true end
  for i = 2, x do
    if allnums[i] then
      table.insert(primes, i)
      local lim = mfl(x / i)
      for j = 2, lim do
        allnums[j * i] = false
      end
    end
  end
  return primes
end
local primes = getprimes(2400)

local ffi = require("ffi")
local C = ffi.C
ffi.cdef[[
long long atoll(const char*);
]]

local function lltonumber(str)
  return C.atoll(str)
end

local q = io.read("*n", "*l")
for iq = 1, q do
  local s = io.read()
  local a, p = s:match("(%d+) (%d+)")
  p = tonumber(p)
  a = lltonumber(a)
  if p == 1 then
    print(-1)
  else
    local v = true
    for i = 1, #primes do
      if p % primes[i] == 0 and p ~= primes[i] then v = false break end
    end
    if v then
      p = 1LL * p
      if a % p == 0LL then
        print(0)
      else
        print(1)
      end
    else
      print(-1)
    end
  end
end