It is rational. The root of a perfect square, such as 4, is rational; the root of any positive integer that is not a perfect square is an irrational number.
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[ square root of (4.1) ] is irrational. But [ square root of (4) ] is rational.
The square root of 16 is 4, which is a rational number.
√16 is rational. √16 = 4.
sqrt(16) = +/- 3 Both +4 & -4 are rational. NB The square roots of prime numbers are irrational e.g. sqrt(2) = 1.413213562.... sqrt(3) = 1.732050808.... sqrt(5) = 2.236067978.... et seq.,
Yes as for example if the rectangle has sides of square root 8 and square root 2 which are two irrational numbers but when multiplied it gives an area of 4 square units which is a rational number.