No because -1/2 is a rational number expressed as a fraction
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No.
It is not irrational because it can be expressed as one integer divided by another: -1/2.
Rational.
There are more irrational numbers in that interval than there are rational numbers in total!
Yes, -1/2 or -0.5 is a real number. It is also a rational number and a nonrepeating decimal rational number. All negative and positive numbers as well as zero are real numbers. The real numbers also includes the irrational numbers.