Determine if a number is Prime. I was recently asked to create a method which given a number would return if a number was Prime or not.

buffer.rb

# determine if a number is prime
  # not divisible by a natural number greater than 1, and less than itself
def is_prime?(n)
  return false if n == 1

  # start the range greater than 1
  # do not include the number itself
  range = (2..(n-1)).to_a

  detection = range.detect do |n2|
    (n % n2) == 0
  end

  return false if detection

  true
end