An even number is a multiple of 2. If you divide a number by 2 (using integer division), and the remainder is zero, then the number is even.
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An even number really has no meaning
No, and the first give-away is that it ends in 2 (an even number, meaning it is divisible by two).
It will always give an even number, as adding any amount of even numbers always results in an even number.
Any odd number plus an odd number will give an even result. Any even number plus an even number will give an even result. Any odd number plus an even number will give an odd result. This is actually pretty easy, you should be able to work it out yourself.
When you multiply an odd number by an even number, you are essentially adding an even number of odd numbers together. Since adding an even number of odd numbers will always result in an even number, the product will be even.