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i, which is *defined* as the square root of -1, is imaginary, not real.
The square root of -1 is i, the square root of -4 is 2i, the square root of -9 is 3i, etc.
i, 2i, 3i, 4i, 5i, etc. = non-real numbers.
'Real' numbers are all of the numbers in the world: integers, rational numbers, Irrational Numbers, positive, negative, etc.
Non-real (imaginary) numbers are numbers that exist only in theory such as the square root of a negative number, or the roots of an equation that never reaches the x-axis. (They are noted with the lowercase letter i for imaginary). This concept is very distant to most people outside of math classes.
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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.
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