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Real numbers are those which can be placed upon a number line stretching to infinity in both directions. To be "not real" you must be unable to do that. We call "not real" numbers "imaginary" numbers. They are numbers which are derived from the square root of -1. If you think about it, what number can be multiplied by itself and you end up with -1. In the real numbers, there isn't one. So we have imaginary numbers. They are written using Euler's notation where i represents the square root of -1. So, to answer your question, i is a "not real" number.

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Q: Give an example of a not real number?
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