It is now possible to install Xposed framework on Samsung Galaxy Grand Prime. The requirements include rooted Grand Prime, stock lollipop ROM and some time. You can use this on both deodexed and odexed Grand Prime ROMs.
Installation instructions:
* Download XposedInstaller_3.0_alpha4
* Install it. It will not work yet but don’t fret.
* Download xposed-v85.0-samsung-5.0.x-By-dkcldark.
* Place it on the sd card.
* Reboot in TWRP. If you are not comfortable with TWRP, you can use ODIN on your desktop to flash it as well.
* Find the zip file nd flash it.
* Wait for the installation.
* Reboot
That is it. You now have xposed framework on your android phone.