How many states did the United Nations propose dividing Palestine into?

It depends on how the question is read.

If it is referring to UNGA Resolution 181 (II), which was passed in 1947 and was designed to deal with the British Mandate of Palestine, it was divided into 2 countries - Israel and Palestine, but the UN had proposed that the city of Jerusalem be made into a separate, international city.

However, as a result of nearly 70 years of conflict, the current plan is to have the Eastern Jerusalem as the capital for the Palestinian State and the Western Jerusalem as the Capital for Israel State. Israel insists to have the whole Jerusalem as Israel capital.