If you have any positive irrational number, then its negative is also irrational.
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The negative of a rational number is also rational.
-Pi is irrational, because it does not terminate or repeat. Whenever you multiply an irrational number by a rational number (-1), the result is an irrational number.
No.No.No.No.
It is a rational number
No, it is not irrational because it is a square root of a negative number - which falls into the set of Complex numbers. Irrational numbers can not have an imaginary component.