5.6491
All of them can be divided by 2, but not necessarily evenly. Only the even numbers from 2 to 798 can be evenly divided by two. There are 399 of those.
399
12.871
0.188
399 divided by 83 equals 4 with a remainder of 67.
362.7273
If you are wanting to add odd numbers to get 399, it won't work. If you are wanting to multiply to get 399, it is 19 x 21.
399*1 = 399. So 399 is divisible by 399. 399*2 = 798. So 798 is divisible by 399. 399*3 =1197. So 1197 is divisible by 399. 399*4 = 1596. So 1596 is divisible by 399.
8.8667
12.871
9.975
133