require 'prime'

T = gets.to_i
MAX_P = 5 * 10 ** 6
is_prime = Array.new(MAX_P + 1, false)
is_prime[1] = true

Prime.each(MAX_P) do |n|
  is_prime[n] = true
end

ans = []

STDIN.readlines.each do |line|
  a, pv = line.split.map(&:to_i)

  break if a.nil?

  if is_prime[pv]
    if a.gcd(pv) == 1
      ans << 1
    else
      ans << 0
    end
  else
    ans << -1
  end
end

puts ans