NO!!!
Because 1.5 can be converted to a quotient ; 1 1/2 or 3/2 .
Irrational number are those were the decimal goes to infinity and the decimal digits are in no particulr orderr.
'pi' is the classic axample at 3.141592.....
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rational
The square root of 15 is an irrational number and it is about 3.873 rounded to three decimal places
It is 15 which is a rational number
The sum of a rational and irrational number must be an irrational number.
rational * irrational = irrational.