There are two main factors about this subject.
The first is that some readers have short attention spans and they shorter chapters somewhere around 1.5-2k words and anything above they lose concentration and interest.
On the other hand, there are also readers, (such as me) who prefer 4k or even more words per chapter as every chapter is also a mini story in itself. I also tend to like slower-paced chapters with more words in them as I like to immerse myself into the story and imagine every segment on it while shorter chapters often tend to be more fast-paced. There are, of course, exceptions to this and not everything is set in stone.
The second factor is the content of the chapter. I usually don't like dividing my chapters into smaller ones because often times they end anti-climatically and often times you can't cut a chapter which has many words because you have to find a satisfying end to a chapter, which intrigues your reader to click on that icon for the next chapter. Also, you have to be careful not to end literally every chapter on a cliffhanger which gets tiring very soon and it's preferable that you find a healthy mix between cliffhangers and non-cliffhangers.
Adding on to this, let's say that you have a whole chapter of just two people talking. That's the entire chapter. Some important information gets revealed to the reader, the pace is very slow, and you describe the inner thoughts of both characters in details. You are barely able to hit 2k words, maybe even 1.8 or 1.5k. And then you have the next chapter, where your team of heroes explores a dungeon, meet some new characters, fight a new enemy and you hit a chapter length of 5-6k because there is just so much going on.
In the end, you can try experimenting with both ways, for example, write one story arc with splitting chapters and one with whole chapters and see how your readers react to it. Good luck.