Just because the app name is "2048" does not mean it is used in the package name. However, I looked up the most popular Google Play game and it does have 2048 in the package name.
You could use grep to get the package. The following example will get the path to the APK file:
bash
adb shell pm list packages -f | grep 2048 | cut -d: -f2 | cut -d= -f1
...
/data/app/com.estoty.game2048-1.apkAn easy way to find out the package name of an app on Google Play is to just search on the Google Play Store and look at the last part of the URL:
https://play.google.com/store/apps/details?id=com.presselite.the2048game