2.6666...repeating is a rational number because it can be expressed as a fraction in the form of 8/3
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26.6 repeating
YES Any rational number taken to any integer power is still rational. Now if you meant to refer to the irrational number Pi - which is approximately 3.14159..., then squaring it does not make it rational.
Is 0.88 repeating a rational number
35 is a repeating number
-26/9