Is the number even?
If the numbers is even return `true`. If it's odd, return `false`. 
Oh yeah... the following symbols/commands have been disabled!
 use of ```%```
 use of ```.even?``` in Ruby
 use of ```mod``` in Python
def is_even(n):
    return str(n)[-1] in '02468'
def is_even(n):
    return str(n)[-1] in '02468'