If you mean what is the probability of rolling either a 1, 2, 3, 4, 5, or 6 on a single roll of a 6-sided die, then the probability is 1 because there are no other ways for the die to fall.
If you mean what is the probability of rolling a 1, 2, 3, 4, 5, and a 6 on a single roll of a 6-sided die, then the probability is 0 because you only get one number when you roll a die one time.
If you mean what is the probability of rolling a 1 on a single roll, then a 2 on a single roll, etc. (all the way to 6), then the probability is (1/6)^6 = 1/46656 = about .00002143347