No, it is rational.
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No. Perfect squares as the squares of the integers, whereas irrational squares as the squares of irrational numbers, but some irrational numbers squared are whole numbers, eg √2 (an irrational number) squared is a whole number.
Rational; 62 = 36. Any rational number that is squared is still rational.
irrational
14 squared = 196, so you're looking for the sqrt of double that, ie 392, which is almost exactly 19.8
Any number, squared, is the number multiplied by itself. So 142 = 14*14. And that, is 196.