Why is Zero an even number?

Till now, we have used the imagery of sharing or pairing objects to understand the idea of odd & even numbers. But what about 0? Is it an even or an odd number? But 0 is not a quantity. It indicates absence of a quantity. Hence, we cannot use the imagery of a collection of objects to decide this question. We need to use the logic of arithmetic, related to odd & even numbers, to decide if 0 is an even or odd number. This is an indicator of the power of arithmetic for answering questions about things which may not even exist in real life! 0 is considered as an even number. There are three ways to justify this. 1. In arithmetic, the idea of sharing in 2 equal parts is represented by the idea of dividing by 2 and 0 is divisible by 2. Hence 0 is an even number. 2. 0 + odd = odd & 0 + even = even because adding by 0 does not change a number. These equations would be true only if 0 is considered even. 3. One more than 0 is 1 which is odd. Two more than 0 is 2 which is even. Hence 0 is an even number.