If you go through it historically, it's not really random, when you see the number of times the balls come up for the first 5 numbers drawn, and the 6th (red Powerball) number drawn. This site
here gives the rundown of all the numbers drawn percentagewise from the most drawn, to the least drawn.
This site here gives the rundown of all the numbers drawn percentagewise from the most drawn, to the least drawn. Given enough time all numbers will occur with roughly the same frequency.
If it's not really random, then you have introduced another factor