点 means clock here，4点多 means a little time past 4

The word means the time between 4 o'clock and 5 o'clock. Usually means between 4 o'clock and 4:15. Usually more than 4:15 minutes, are expressed in a specific time. Different places are also different.

It's not 4pm sharp, but about 4 pm

4:40, you can say 过四点半了or快五点了or四点四十。

多is "more" 2点多means2:00-2:30. 点is“：”