I requested to read a book by the number 256. You asked my to prove that I am professor and researcher. I sent to you my informations. You accepted these informations.
Your question is not clear. Please note that you wrote to the ResearchGate community, i.e. users like you. To whom you intended to address your question? Where did you demand a book?
If you mean the request for a full-text in ResearchGate: This does not mean that you will get the requested publication from ResearchGate. It just means that a message was sent to the author(s) that you requested their publication. They may send you the full-text or may not. But these requests are not numbered. See https://help.researchgate.net/hc/en-us/articles/14292986311825-Discovering-and-requesting-research for more information.