The line above the 6 and 3 means that those are recurring, so the full number is 2.63636363.... Recurring numbers can never be defined by decimals, because there is no end to the numbers repeating. It can only be defined by a fraction, so that means the number is irrational. Because it is between integers (a fraction that can't be simplified and will give a recurring decimal), it can't be a real number. All rational numbers are real numbers, but no irrational number can be a real number.
Therefore, your answer is 'Irrational number'.
Hope I helped!
