Rational number - a number that can be represented as the quotient p/q of two integers such that q ≠ 0
-Britannica
By that definition is any number which has the decimal part $.999...$ irrational?
Also, furthermore can we argue that 0.999..., a recurring decimal is in fact imaginary since we say it is =1 or ≈1
$0.999\ldots = 1\in\mathbb{Q}$