Hello Samyak Veera,
did you purchase your product from these firms like Amazon? If yes, this is not a serial number, only a code with which you can request a serial number from Adobe. Please have a look at http://helpx.adobe.com/x-productkb/global/find-serial-number.html. (Start here: How did you purchase your product?)
The following part, so I just see at least, ceased to exist on my Adobe website, everything takes place in the link from above. I leave it as an info yet, it might still fit for you. For this purpose, please click your way through to your Adobe Store and find the button "Get Serial Number". Fill in the form and after a while you will get the real serial number.
... if necessary and for further questions click through http://helpx.adobe.com/contact.html 'till you arrive at "chat". If "open" please use it, I for my part had the best experiences. I quote from Adobe's employee Preran: The chat button is activated as soon as there is an agent available to help.
Hans-Gunter appears to have covered the important parts of your Premiere Pro issue.
Just in case note....you say that your product is Premiere Pro, yet you post your thread in the Adobe Premiere Elements Forum instead of the Adobe Premiere Pro Forum.
Moving forward, when you make your search in Hans Gunter's links, please seek the choices for Premiere Pro.
If you want to post a thread in the Adobe Premiere Pro Forum, consider the link
While the title says Premiere Pro, the message mentions needing a serial number
The last version of PPro that used a serial number is CS6
If the program is actually Premiere Pro CS6, that does need to be reported so this message may be moved