How do I get this chubby girl's number?

I (23m) recently moved into a new apartment complex as a medical student. I am still trying to get settled in. I met up with the other students in the building and we had a get-together in the community room. One of the girls from the building (who I now know as Mia) also joined the party. She was around 180 lbs (~82kg) and I immediately though she was so friggin cute. We talked for a while and she is super chill and kind. I find myself drawn to her and would love to get to know her as well as possible. How do I ask her for her number?