No, You plant them as you would a bean. If you mean shell them , then yes.

The germ would stay on one side or the other if split. Also splitting would not protect the seed while germinating nor leave as much food for the seedling.

Agree. Just as you wouldn't plant 1/2 a bean seed, exposing the embryo germ by splitting the peanut would likely kill it before it can sprout and the other half would be sterile.

Dave