Square root of rational nos

Square root of a rational number

The positive square root of the rational expression. [y^3 - 1/(y^3) - 3 (y - 1/y)] div (y - 1/y) is

Are the square roots of all positive integers irrational ? If not, then give an example of such a positive integer, the square root of which is a rational number.

Are the square roots of all positive integers irrational? If not,give an example of the square root of a number that is a rational number.

Are the square roots of all positive integers irrational ? If not give an example of the square root of a number that is a rational number

Are the square roots of all positive integers irrational? If not, give an example of the square root of a number that is a rational number.

Are the square root of all positive integers irrational ? If no, give an example of the square root of a number that is a rational numebr.