Because the description which is given is sufficient to decide whether or not any given number is in the set.
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Any well-defined set of numbers.
No. The sum as well as product of two even numbers can only be an even number.
There are 999 whole numbers less than 1000. Whole numbers are all the positive integers starting from 1 up to 999. The number 1000 is not included because it is not less than 1000. So, the total count of whole numbers less than 1000 is 999.
Count
Counting can theoretically continue indefinitely, as numbers are infinite. However, in practical applications, counting typically ends when a specific quantity or range has been reached. For example, when counting objects, the counting ends when all objects have been accounted for. In mathematics, counting can also end when a specific number or pattern is identified.