Is square roots of 42 is rational or irrational?

The square root of 42 is irrational, because 42 is not a perfect square, meaning no number times itself will equal 42. This is because 6 x 6 = 36 and 7 x 7 = 49, so 42 is between those two numbers. Any number that is not a perfect square is irrational, therefore 42 is irrational

The answer is 6.48074069, which is irrational.