A line over a whole number means that number repeats for an infinite number of times.
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The line is usually taken to mean that the decimals under the line repeat. And yes, such a number is rational, since it can be converted into a fraction (with whole numerator and denominator).
The line over a fraction number means division. For example 2/4. 4 divided by 2 is 2. Add to the the numerator and you get 4/4. 4/4 is equal to one whole.
if used in a decimal it means that the number it is over is repeating ex) 27.33333333333333 instead you could write 27.3 with a line over the 3
1 over 3 is not a whole number.
If there is a bar over a number it means that it is an irrational number or possibly an infinite number. A number with a bar over it cannot be considered a whole number.