No. Any number with a terminating or repeating decimal expansion is rational.
"Rational" in numbers means that it can be expressed as a ratio of integers (i.e. a fraction) .... in this case, -12/5.
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It is an irrational number because it can't be expressed as a fraction
13/24 is a rational number
The sum of a rational and irrational number must be an irrational number.
rational * irrational = irrational.
No, 3.56 is not an irrational number. 3.56 is rational.