The 1st time you roll a 6 sided die, you have a 1/6 chance to roll a 6.

The 100th time you roll, you still have a 1/6 chance because it's still a 6-sided die.

The 100000000th time you roll, you still have a 1/6 chance to roll a 6 because it's still a 6-sided die.

If you have rolled four 6s in a row, then on the 5th roll you have a 1/6 chance to roll a 6, because it's still a 6-sided die. Completely apart from that, the chance of rolling five 6s in a row is 1/7776, because there are 7775 other possible combinations for those five rolls.