It'd be the product squared, since you're multiplying it by itself. the product of a number multiplied by itself is called an Exponent, Power or Square Number
Yes, it is possible only if an irrational number is multiplied with 0.
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
A square number.
It is called a Square Number or a Square.
The number is 40
The number is 60
No it is not. 22 is not a perfect square because it is not a product of a rational number multiplied by itself. The closest perfect square would be 25
Yes. Since 0.555 and 0.5 are both rational numbers, their product will be rational.