Can I use the burner app for the square pos?

I belong to a non-profit org that has periodic sales to support the venue in which we have our art & craft meetings/workshops. We would like a method to accept credit cards for the occassions when we hold our sales. Sales only occur 3-4 times per year as well as occasionally to our own members (60 of us) daily. Typical pos machines do not allow this flexibility & r very expensive, if not impossible. Would a burner phone or burner app fill our need?

Square Credit Card Reader

Square Credit Card Reader

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