Chickens are very sociable, flock oriented animals. They may not die if raised alone, but they will be happier when raised with their own kind. I had 2 hens once, and one was killed. The remaining hen was very unhappy, so I got some more grown hens to keep her company.
ALL WRONG things to do.
1. I didn't quarantine the new birds for a minimum of 30 days, which is crucial.
2. I just stuck them all in the coop together, with no introductory period, separated by wire after the quarantine. I had to treat a lot of fighting injuries until the pecking order was established.
That was 19 years ago, I know better now!
I did just recently have a chick that was alone for 2 weeks before the next hatch. He was miserable, even with his stuffed monkey for comfort. When the next batch hatched, I divided the brooder so they could see and hear each other. By day 3 or so the solo chick had hopped over to the other side. He is still the "mother hen" to that bunch!