By default, the routing events are not logged. So as Maximus suggested, you must have added code somewhere to turn them on. You just need to remove that code.
In my app, I turned on routing events here, in the app routing module:
RouterModule.forRoot([
{ path: 'welcome', component: WelcomeComponent },
{ path: '', redirectTo: 'welcome', pathMatch: 'full' },
{ path: '**', component: PageNotFoundComponent }
], { enableTracing: true })
If you have code like this, either remove the enableTracing or set it to false.