Wikipedia wrote:A formal definition of an even number is that it is an integer of the form n = 2k, where k is an integer; it can then be shown that an odd number is an integer of the form n = 2k + 1. This classification applies only to integers, i.e., non-integers like 1/2, 4.201, or infinity are neither even nor odd.
Henry Wong wrote:If 1.3 is odd, then is 1.30 even? ...
And what about pi? We have to look at the last digit... 3 point 1 4 1 5... okay, this could take a while, I will post back when I find out.
Stop counting. Pi is even since it is equal to 180. And so is pi / 2, but pi/4 is odd. Which is odd, since any other real or complex number is even.
Even more remarkable is that pi is a prime number, since it is not the product of any other primes. But the probability that I am serious is a genuine even number.