Curious Number A n-digit number is said to be curious if the last n digits of its square are the same as the original number. For example, 25^2 = 625 and 76^2 = 5776. (Curious numbers are also known as automorphic numbers.) An example of 9 digit number: 212890625^2 = 45322418212890625 Write a program to find all Curious Numbers of 1 to 10 digits.

curious_number.rb

def square(number=0)
  number ** 2
end

def is_curious_number(number)
  diff = square(number) - number
  last_digits=diff % (10**(number.digits.count))
  if(last_digits==0)
    return true
  else
    return false
  end
end

#checking
puts is_curious_number(25) #=>true
puts is_curious_number(26) #=>false