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.
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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