The definition "relatively prime" is 2 numbers that do not share the same factor. So 2 even numbers, whatever they were, are both dividable by 2, which doesn't make them relatively prime.
Example: 2 and 4, they are both dividable by 2. So they're not relatively prime. Same for 8 and 4, 10 and 16, etc...
Hope this Helps! :)
