An even number is an integer that is exactly divisible by 2, meaning it has no remainder when divided by 2.

An odd number is an integer that is not exactly divisible by 2, meaning it has a remainder of 1 when divided by 2.

0 is an even number because it is divisible by 2.

The result of adding two even numbers is always an even number.

The result of adding two odd numbers is always an even number.

The result of adding an even number and an odd number is always an odd number.

To determine if a number is even or odd, check if it is divisible by 2. If it is, it is even; if not, it is odd.