I am not sure exactly what you are wanting to do...

If you want to display all thumbnails on your page alongside you main image, then you would need to define the thumbRows and thumbColumns configuration options so that the resulting grid contains enough spaces for all of your thumbnails, e.g.:

thumbRows="5"
thumbColumns="6"

If you want to have all your thumbnails displayed on a dedicated thumbnail page (from which a user can select a thumbnail to display the corresponding main image), then you can force the gallery to be displayed by the Mobile Player (on all devices and in all browsers regardless of whether or not Adobe Flash Player is available) by setting the useFlash Embed Code Parameter to 'false' (in the svBuilder-Pro 'Customize -> Embed' section).
Please bear in mind that the number of thumbnails displayed on each thumbnail page will depend on the dimensions of the gallery and the size of the user's browser window.
Also, the Mobile Player has fewer configuration options than the Flash Player.

If you want numerals to appear over the thumbnail images themselves, then you would need to create custom thumbnails in an imaging program such as Adobe Photoshop (adding numeric text as an overlay) and replace the thumbnails in your gallery with your custom thumbnails.