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The so-called "real numbers" are simply numbers that permit decimals. Think of them as numbers in scientific notation, which allow very big or very small exponents (somewhere in the range of -300 to +300), and about 15 significant digits. Since their precision is not unlimited, they do not exactly correspond to what is called "real numbers" in mathematics.
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Can a square of real number is a real number?
The square of a real number is always a real number.
Is zero a real number?
Yes, zero is a real number. It is not a counting number, but it is an integer, a rational number, and a real number.
Can a number with a square root be a real number?
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.
Are there real number that are not rational number?
A real number dosen't have to be a rational number as a real number can be rational or irrational i.e the root of 2 is irrational and real. So is (pi).
Is 3.125 is a real number?
Any decimal number is a real number.
