Hi Reshma,
As far as I understand, the report that you get is correct. You have in your database more than 750 suppliers and most of them are "potential suppliers" which means that you can invite them to an event or add to a contract workspace.
If you want to know how many suppliers do you have awarded and with contracts you should use other reports based on Sourcing and Contracts.
Be careful, if you deactivate a supplier, this won't appear as an possible participant of an event for example.