No; it is a rational number.
An irrational number has a non-terminating, non-repeating decimal.
12.666666666 either terminates (= 12666666666/1000000000) or if you mean the 6 recurs (ie goes on forever: 12.666... = 38/3).
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An irrational number.
When added to a rational number, any irrational number will produce an irrational number.also, when added to an irrational number, any rational number will produce an irrational number.
It is not an irrational number!
Yes, it will always be irrational.
It is not always irrational.