How to test which port MySQL is running on and whether it can be connected to?

I have installed MySQL and even logged in there as a user. But when I try to connect like this: http://localhost:3306 mysql://localhost:3306 Neither works. Not sure if both are supposed to work, but at least one of them should :) How can I make sure that the port is indeed 3306? Is there a linux command to see it somehow? Also, is there a more correct way to try it via a url?