The square root of both 0 and 1 equals the square of 0 and 1
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1
The sum of a single number is itself. So the only number whose sum equals 2 is 2.
4
The area is equal to length x width. Both length and with of a square are the same. The only number multiplied by itself that equals an area of 49 is 7.
Of course, not only can it be a real number but it is a real number. When you take the square root times itself, the result is a number that is real.