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In most case you must multiply the number by itself.
When the number is irrational ( meaning it cannot be expressed as a fraction,) you may end up with a one that is rational ( can be expressed as a fraction).

For example, the 2 squared is 2x2=4
square root of 2 is irrational but square root of 2 times itself is 2.

Pi is an irrational number but PixPi is Pi2 which is still irrational.

Even complex numbers can be squared by multiplying the number by itself.
So a+bi is a complex number and (a+bi)2 =(a+bi)(a=bi) where i is the square root of -1.

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Q: How does one calulate the square of any number?
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