A stupid job post on Upwork asking to write this. An easy US$ 8 I missed (didn't get the job). :(

Prime.rb

#!/usr/bin/env ruby
print "Enter a number: "
input = gets.to_i
divisors = []
(2...input).each do |i|
  divisors << i if input % i == 0
end
if divisors.empty?
  puts "#{input} is a prime number"
else
  puts "#{input} is not a prime number => #{divisors.join(', ')}"
end