An even number is an integer which is "evenly divisible" by two. This means that if the integer is divided by 2, it yields no remainder. Zero is an even number because zero divided by two equals zero, which despite not being a natural number, is an integer. Even numbers can be either positive or negative.
An integer that is not an even number is an odd number.
Addition and subtraction[change | change source]
Note: the symbol '±' mean either addition or subtraction.
- even ± even = even
- even ± odd = odd
- odd ± odd = even
0N, 2N, 4N, 6N, ... (where N is any natural number)
the result is always an even number.