Is this white mold?

This is in my apartment and I’m going to the office tomorrow hoping this is mold so I can get out of my lease

UPDATE: this first photo was taken a few months ago when I had let them know about it but they still haven’t looked at it

Before:

And this is current below. Overtime it just got like this so I’m thinking it’s mold? There was a leak right here before so I don’t know

J