Rational
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No. It can be written as 62/100 .
The square root of (any number that isn't a perfect square) is irrational.
The exact value is an irrational number, and can't be written on paper with digits.0.34202 is less than 0.000042 percent wrong.Cos(70 deg) is an irrational number and it is impossible to give its exact value.
The sum of a rational and irrational number must be an irrational number.
rational * irrational = irrational.