Mulitply the number by itself
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Not quite sure what you mean. First of all, you need to specify, the square root of what number. Different numbers have different square roots. Just about any calculator can quickly calculate the square root of any number you want. The result is shown as a decimal.
-- Write down the number of kwh -- Write down the number of square feet -- Divide the first number by the second number. -- The answer is mathematically correct, but doesn't appear to have any physical significance in the real world.
Please note that the square root of a negative number is an imaginary number. Many calculators are unable to calculate that.Take the square root of 90 (any calculator can do that). Then attach an "i" at the end of the number, to indicate the imaginary unit.
There are infinitely many. Calculate the square root of 250, and round it up. The square of this number will be the first one. The square of any larger integer will also be a perfect square larger than 250.
The square roots of any positive real number are a positive and a negative real number. The square roots of any negative real number are a positive and a negative imaginary number. The square roots of any imaginary number or any complex number are two complex numbers.