Yes, the product of two whole numbers is a whole number. For example 3*7 = 21
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Yes. That means that the product of two whole numbers is defined, and that it is again a whole number.
A non-zero whole number.
1 and 2, whose product is 2.
The product is also a whole number. If the (number of positive factors) minus the (number of negative factors) is zero or an even number, then the product is positive. Otherwise the product is negative.
Only if the other number is not a whole number but has a decimal.