It is difficult to show a superscript 2 (tiny 2) at the top right-hand corner of an integer that is squared on Answers.com. So I would do something like this: n x n = n sq.
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x is an irrational number
On a computer, you can type the square of a number (let's say x) as x^2. For example, five squared is typed as 5^2.
A number squared means that the number is multiplied by itself.
The question is ambiguous. If you meant negative (64 squared), the value is -4096, which is a negative integer. If, instead, you meant (negative 64) squared, the value is +4096, a positive integer.
If a number is to the power of 2 it is "squared". The number that is squared is the "root".