no
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066 = 66 is an integer and not a fraction. However, it can be expressed in rational form as 66/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Yes.
Yes, but only if the rational number is 0.
Only if the rational number is 0.