What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Depending on what kind of a number you need, yes, that would be possible.
For example, the submission ID - a unique number identifying each submission is available on the thank you page.
You could also create a certain (reference) number on the jotform itself and have it shown on the Thank you page only.
Do let us know more and we would be happy to assist you in setting it up :)