Royal Flush
A Royal Flush is the highest hand in poker. A Royal Flush is the highest version of the Straight Flush. For a royal flush, you get 5 cards of same suit (flush) gain. These cards should all follow similar and begin with 10. An example of a Royal Flush is shown below.
There are 40 possible straight flushes, including four royal flushes. The chance that you are dealt a straight flush is 0.00154% and the chance that you get is one royal flush shared 0.000154%.
It is clear that the chance of getting a royal flush is extremely small. One hand on the 649739 is a royal flush. So you have to play very many hands to see a royal flush.