The article below is a general guide to protecting your wireless router from hacks. I have taken all the steps I needed to, but my provider instructed me that the most important step is to use the most powerful encryption (WPA2), which I now do.
There are no guarantees, but I have taken as many steps as possible for me currently to protect my router.
The other thing to keep in mind are all the wireless devices connected to your router. For me I have my mobile, tablet and printer. Both my tablet & mobile have Anti-Virus (AV) internet protection. It has been explained to me that for the printer, as long as it is connected to a PC that also has AV, then that is doing what you can to protect it.
This what my mobile internet protection status shows:
Link to article: