Question

Classify the following numbers as rational or irrational.
$\sqrt{441}$

Answer 1

A rational number is part of a whole expressed as a fraction, decimal or a percentage. ... It is a number that cannot be written as a ratio of two integers (or cannot be expressed as a fraction). For example, the square root of 2 is an irrational number because it cannot be written as a ratio of two integers.

Given number $\sqrt{441}$

Then $\sqrt{441}=\sqrt{2\times 2\times 7\times 7}=21$ is the perfect square

So $\sqrt{441}$ is the rational number