How do I ask my crush for her number?

Long story short, I’ve been in a class with this girl for around five months but in that time period I wasn’t really sitting near her and we didn’t ever notice each other. We recently moved seats and I’ve been sitting next to her for around two weeks. We’ve talked a little bit and have made eye contact a lot too but I’m wondering, should I make up an excuse to talk to her more, how should I play this out?

I’m pretty sure she is into me as well however I want to be able to talk to her more and don’t really know how to jumpstart conversations like that… any ideas?