Is the printer software installed on the laptops? Are you trying to print from the laptop itself, or a phone or tablet?
Sounds like from what you said the devices are on the network, but they still need the correct software to communicate with each other.
Try to use a smartphone and install the HP mobile printing app, if that app is able to find your printer, it is indeed on the network correctly.
If you can print from the phone/tablet, but not the laptops, you need to install the software drivers for your printer to your laptop(s) you wish to print from.
Here is a link to the Windows Drivers
HP Software drivers -
HP Deskjet 6988 Printer Software and Drivers
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