Q: Is MacKeeper something I should download for security purposes for my MacBook Pro?

Do not download MacKeeper, for any reason at all.

There are no Mac viruses to find, and cleaning your laptop should be done externally, with a fine damp cloth.

Windows habits belong on Windows.

Avoid MacKeeper like you would herpes. Refer to Apple Support Communities contributor Klaus1's User Tip for a more thorough explanation: Do not install MacKeeper

There are no OS X viruses therefore there is nothing to check for. The Mac already includes all the protection it needs against viruses and malware. A much bigger threat are the multitude of worthless utilities from companies with the audacity to claim they know more about the Mac more than the engineers who designed it. This site is littered with problems caused by such junk.

To clean your MBP: How to clean Mac products

Your Mac is designed to be used, not pampered. Drive it like you stole it.

Read: Tips to keep your Mac in top form

At all cost avoid the MacKeeper.  It will bog your Mac down to no end!