Euler problem 3

projectEuler

# The prime factors of 13195 are 5, 7, 13 and 29.
# What is the largest prime factor of the number 600851475143 ?

number = 24
array = []

# how do I iterate a number? Is that a loop?
array.each do |num|
  if num % 1 == 0
    array << 1
  else num % 2 == 0
    array << 2
  end
end
puts array

# ERROR: undefined method `each' for 24:Fixnum (NoMethodError)