Root of a number x is the new number y, which can be calculated as
y = ( x ) 1/n
where n is the root number i.e. nth root of x is y.
Are you talking about negative powers.
What are the integers between 0 and 100 whose positive square roots are integers?
No.
a perfect square
It is a perfect square.
Such a number is called a "perfect square".
They are squares of rational numbers. there is no particular name for them.
It is a perfect square.
Perfect Square
Such a number is called a "perfect square".
All of the integers between 20 and 30 are square roots.
A factor tree has factors, not square roots - unless they are integers.