To add to what Keeran has said, there are two other ways to use it:
1. adjective - meaning an equal amount. (example "There are an even number of boys and girls in the class" means there are 50% boys and 50% girls in the class)
2. adverb - for emphasis or to show surprise (example " What do you know about it? You have never even been there!" - in this example you could say "What do you know about it? You have never been there!" and it would mean exactly the same thing...just not as strong a comment).