Is 18 an irrational?

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No.  An irrational number cannot be expressed as a/b where a and b are integers, b not zero. 18 = 18/1 = 36/2 = -36/-2 etc.
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Is -18 an irrational number?

No. If you can write the number on paper, it's rational. -18 is the ratio of -18 to 1, and also the ratio of 18 to -1.

Is 18 rational or irrational?

18 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.