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That probably refers either to an imaginary number, or to a complex number. Despite the weird name, the "imaginary numbers" (and the complex numbers) have many uses in math and science.

Q: A number that is not real?

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It is a real number, but it is not a whole number

yes it is a real number

A real number is a number that does not have an imaginary component. There is no imaginary component in -17, so it is a real number.

Yes it is, but not every real number is a rational number

Yes it is infact a real number in algebra

Related questions

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.

It is a real number, but it is not a whole number

a real number is a number that can be rational or irrational

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.

13297126 is the number real

If a number is pure imaginary then it has no real component. If it is a real number, then there is no imaginary component. If it has both real and imaginary components, then it is a complex 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).