It is normally a dot over the decimal digit or over the first digit and last digit if there are more than one recurring digits.
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If it is a terminating or recurring decimal then it is not irrational. If it is an infinite, non-recurring decimal, it is irrational.
0.33... with the 3s recurring forever is the decimal equivalent of 1/3 .
1/15 as a decimal is a recurring decimal: 0.066... with the 6 recurring forever; it would be usual to approximate the decimal by rounding to a number of decimal places, eg to 5 decimal places it is approx 0.06667
To convert a fraction to a decimal, divide the denominator into the numerator. Whether it is recurring or not depends on the fraction.
Expressed as a decimal, five ninths is equal to 0.5 recurring (that is, 0.55555...).0.55