God I wish there was an easier way to do this

Am I missing something? Can't just use number % 2 == 0 return true else false?

Yeah, you're missing the floating point bug. Your code works for trivial cases, but if you're using it on a number that *might* have been from a math operation, or from a number that was cast from a string, then the floating point bug might cause that to return the wrong value.

The function param is int, so with the type cast it does in fact work, no floating decimals