Uranus wasn't made that way. Like the other planets, it was formed as an independent world in the outer solar system. Planets do not have to 'divide' to create other planets. What happens is like the way you make a snowman. You start with a small snowball and keep rolling it.
Planets start as large asteroids that keep gobbling up their neighbors.
The stars we can study have many of the same properties that the sun does, so it is also a member of the 'star' family of things in the universe. It actually depends on where you are. In its core it is about 15 million degrees hot. Im not sure what you mean. Sorry about the miss-spelling.