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A number is a member of a group of other items for which one or more opertations (like addition or multiplication) is defined that result in other members of the group. For example:
- Counting numbers: 1, 2, 3, ...
- Whole numbers: 1, 2, 3, ... and sometimes 0, 1, 2, 3, ...
- Integers: -2, -1, 0, 1, 2, ...
- Rational numbers: 1/2, -3/7, 0, ...
Zero is not a counting number, but it is integer, rational, real, complex number and many others. The notion of evenness applies to integers. A number N is even when it's evenly divisible by 2, which means that N = N/2 · 2. Therefore, by definition, zero is an even number. |