Guys, what are your intentions when you ask for a girl's number?

We were meeting for the first time with a group of friends, he's in a different class, and when I was about to leave he asked me my name and then started searching me on Instagram. I told him I'm not on social media so then he asked me if I'm on WhatsApp and my WhatsApp number. He then told me to save his number as well by his nickname AZ. I was like a bit taken aback by how he was so blunt...
Guys, what are your intentions when you ask for a girl's number?
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