Yes it is. Any number that you can write completely using digits,
and a decimal point or a fraction bar if you need one, is rational.
If the number you wrote in the question is all there is to it, and
it doesn't keep going on forever, then it's rational.
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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.
A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.