√6 = 2.449489742783...........
Is a irrational number, because an irrational number is a number that con ONLY be written as a decimal, and not as a ratio/fraction and this number CAN'T be written as a ration/fraction.
On the other hand rational means that a number can be written as a ratio/fraction AND a decimal.
So, this is an irrational number.
Hope I helped ya!!!!!!!!!