Nantucket Sinks UM-13x10-W 13-Inch by 10-Inch Oval Ceramic Undermount Vanity Sink, White

Does the pop up drain come with this sink?

Is the exterior bottom painted? I planned on putting it under a piece of marble and mounting to the wall.

Is it easy to clean and does it stain easily? I’m looking for low maintenance. Thanks

How do you access the drain if it becomes clogged? The pop-up does not seem to unscrew like most.