is it possible to increase stats with console?
No, very difficult. Perhaps you could look at what happens when you grow normally, and input the same command... but it's far easier to take a value, like Level, a certain Stat, or the number of a certain essence in your inventory, and make that value a unique number. Then, go to a save editor (saveeditonline), search for that variable's exact value, and change it to what you want it to be. It works for followers in 4.5 and below, when you can freely check their stats, but it's much more difficult in 4.6.
EXP is also a value that can be changed to make them grow, though.