Are you sure ? All my routers have been 192.168.1.1
The router's address can in principle be any valid IP address.
e.g. 1.1.1.1, 97.123.210.222, 8.8.8.8, .......,
A while back by convention people often used to use the last address in the network range for the router (default gateway), hence 192.168.1.254. The range is specified by some address in the range (ideally the zeroth one) and the netmask. The netmask specifies which address bits are "network" bits and which are "host" (or device if you like) bits.
More recently we seem to use the first one (above the zeroth). So ending in .1 is common.
I look after about 400 Huawei Mifi devices and they are either 192.168.1.1 for all except the latest model or 192.168.8.1 for the new one.
Of course if you chose 8.8.8.8 for your router you will most likely have some difficulty of communication with a particular google DNS server which is also 8.8.8.8. and possibly other devices on the 8.0.0.0 255.0.0.0 network too.