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I am not at all sure that there are any rules that apply to integers in isolation. Any rules that exist are in the context of binary operations like addition or multiplication of integers.
Oh, dude, you're really making me work here. Okay, so the largest five-digit number with no prime digits would be 98760. I mean, it's not the most exciting number, but hey, rules are rules, right?
Note that there are no Official Poker Rules. House Rules apply and there are big differences from casino to casino (or kitchen table to kitchen table). Swapping three cards is the most common, but in a lot of places swapping four cards and sometimes all cards is in the rules. If you're playing a home game, you will have to decide amongst yourselves what to do. In my experience, you can draw any number of cards, between 0 and 5.
-9 - (-5) = -4 You know like you do: -10 - 9 is the same as -10 + -9 that seems easier ^^ The same rules apply to -9 - -5. When you change the subtraction sign to a plus, you have to make the negative five a positive.
Find your number, look Right next door, five or more just add one more, four or less just ignore...