Negative Number- is any real number less then zero on a number line.
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The short answer: That is the definition of multiplication with negative numbers.
Yes they have to be whole numbers. They can be negative though, but they have to be whole.
Negative numbers cannot be rooted. As it can be seen on a calculator when -25 is rooted is says error. Only positive numbers can be rooted. If it resulted in a negative try going over the problem.
No it is not. By definition, a prime number must be a natural number. Negative numbers are not in the set of natural numbers.
There is no single commonly accepted definition for "whole numbers". Depending on the definition used, zero, as well as negative integers (like -1, -2, etc.) may, or may not, be considered part of the "whole numbers".