Is it weird for a random girl to offer a random guy her number, without a conversation or any rapport building?

Some random woman walked up to me and told me her name, and handed me a piece of paper with her number on it and said she wanted to hang out. That was the entire interaction. Is that weird?

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+1 y
She did mention she worked at some local department store, so she doesn't sound like a hooker. But the interaction was unique, in that that hasn't happened to me before.
Is it weird for a random girl to offer a random guy her number, without a conversation or any rapport building?
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