Hi,
Check if Number Lock has been disabled in BIOS.
Start the laptop and press F2 before the laptop boots into Windows i.e. when the Dell logo is on the screen.
When in BIOS use the arrow keys to navigate through the menus.
Go to the ''Post Behavior'' menu > ''Numlock Enable'' and verify that it shows enabled.
Here’s the [https://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_latitude_laptop/latitude-e6530_owner%27s%20manual_en-us.pdf|service manual] for the laptop. See p.64 for how to enter BIOS setup and p.70 for the Number lock entry.