No.
No.
No.
A cillion is not a recognized mathematical term or number. If you meant to refer to a "septillion," which is 1 followed by 24 zeros, or an "octillion," which is 1 followed by 27 zeros, please clarify. It's important to use standard numerical terminology to avoid confusion in mathematical discussions.
The square of a real number is always a real number.
The real number in '101.7' is 101. A real number is a positive whole 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.
Nearly any number you can think of is a Real Number. So 8 is a real number.
The other real number is 3/pi. I will bet that was not the real number you had in mind and so is an "other" real number.
a real number is a number that can be rational or irrational
It is a real number, but it is not a whole number
No, it is not 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.