28 squared is 784 which is a rational number
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20 squared is 400 which is a rational number
No because pi still remains as an irrational when squared.
81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
The square of any rational number is also rational.
It would simply be the irrational square root of a rational number. There is no special name for it.