An even number is a number which is divisible by 2.

A dozenal number is even if and only if it ends on 0, 2, 4, 6, 8, or X.

A number is even if and only if its prime factorization contains the prime factor 2.

The parity of a number is defined to be whether the number is even or odd. An even number has parity 0.

The product of an even number and any other number is even, regardless of the parity of the number. Moreover, if at least one of the whole numbers in a product is even, the product of the numbers is also even.

The sets of even numbers is defined as