i figured out a fun way to get the biggest prime number.  say you get the number n. lets use 105 as an example.  you start dividing by 2 and increase 1 if result is not a whole number.  so 105/2 = 52.5 (not whole) 105/3 == 35 (whole, cool)  so now we have 3 as one of the factors and now we use 35 and repeat the process  35/2 = 17.5 (not whole)  35/3 = 11.6666~ (not whole)  35/4 = 8.75 (not whole)  35/5 = 7 (whole)  so now we have 3 and 5 as factors and are left with 7.  7/2 , 7/3, 7/4, 7/5, 7/6 are all not whole, so 7 is our last prime factor.  105 = 3*5*7 , 7 being the biggest prime factor.  is there a name for this process?
common sense