This is a difficult question to answer, as it depends on a number of factors - the overall length of your novel, the pacing of your story, the style of your writing, etc. In general, however, a good rule of thumb is that each chapter should be around 3,000-5,000 words. This gives you enough space to tell a complete story, while still keeping the reader engaged.
If you're worried that your chapters are too short, there are a few things you can do to make them more substantial. First, take a look at your pacing - are you telling your story too quickly? Slow down and give your readers a chance to really get involved in the lives of your characters. Second, focus on providing more detail - flesh out the scenes and settings, and really let your readers experience them. Finally, make sure you're cutting out any superfluous material - if something isn't moving the story forward, it probably needs to go.
If you're still not sure whether your chapters are the right length, the best thing to do is to ask a few trusted readers for their opinion. See what they have to say, and then make an informed decision about whether or not you need to make any changes.
