How do you know the number of decks? Do american casinos tell you?

I am not in America and in my country there are not very many casino so I am scouting some out. The one I want to go to has their rules online and it says they use “multiple decks”.

Would you just go there and try to judge the number of decks by looking at the shoe? Or would you call and ask?

Sorry I’m kind of new at this

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