Examples of such numbers are 49, where sqrt(49) = 7, 81, where sqrt(81) = 9.
Such numbers are called square numbers.
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its called a "perfect square"
A perfect square.
A whole number whose square root is also a whole number is called a perfect square. In mathematics, perfect squares are numbers that can be expressed as the product of an integer with itself. Examples of perfect squares include 1, 4, 9, 16, and so on.
What are the integers between 0 and 100 whose positive square roots are integers?
How about 27 whose cube root is 3 which is a rational whole number.