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No. Zero is a rational number, but division by zero is not defined.
No. Closed means that you could do the operation (division) on any two natural numbers and you would get a result in the natural numbers. Take 7/3 for example, this is obviously not a natural number.
The set of whole numbers is not closed under division (by non-zero whole numbers).
No, it is not.
What is the nearest 100 457