Are cubed numbers closed under multiplication?

Answer 1

Yes. If you have two positive integers "a" and "b", and their corresponding cubes "a^3" and "b^3" (using "^" for "power"), then the product of the two cubes would be a^3 times b^3 = (ab)^3. Since the product of "a" and "b" is also an integer, you have the cube of an integer.

Answer 2

Yes, they are.