An even number is any number divisible by 2 without remainder. eg 4 or 12345678 etc.
To save you having to divide, any number whose last digit is 2, 4, 6, 8, or 0 is even.
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Any even number greater than two.
A banana. It is not even a number so it is a brilliant non-example.
All even numbers from 4 upwards are composite numbers and that 2 is the only even prime number.
Natural (counting) numbers; integers; rational numbers; real numbers; complex numbers. And any other set that you choose to define, that happens to include the number 4 - for example, the set of square numbers, or even numbers, the set of the numbers {3, 4, 5, 7, 14, 48}, etc, the set of numbers containing the letter o in their English name.
All even numbers can be divided by 2, but they all don't have 2. For example, 1000 is a perfectly reasonable even number that doesn't have a 2 in it.