Should you ask for a woman's number/contact after getting to know each other for a while?

Sp you meet a girl at a store or farmers market and you're able to small talk for a bit and see each other every once or twice a week and its Bern a while and is friendly, would that be afterwards appropriate to ask for contact after knowing each other for a while?
Should you ask for a woman's number/contact after getting to know each other for a while?
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