The ornamental design for wireless router, as shown and described.
FIG. 1 is a top right perspective view of a wireless router, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a left side view thereof.
The broken lines shown in the views are included for the purpose of illustrating portions of the wireless router that forms no part of the claimed design.