The AMD ATI Radeon HD 4250 (sometimes also ATI Mobility Radeon HD 4250 called) is an onboard (shared Memory) graphics chip in the RS880M chipset. It is based on the HD 3400 graphics core and features the UVD 2 video engine to decode HD videos. Compared to the HD 4200, the 4250 offers a similar performance, but the power consumption could be a bit better.
It uses a UMA.
You can also confirm this by looking at your power adapter. According to the HP 625 laptop user guide Page iii, as the UMA systems (considered "onboard graphics") come with a 65Watt adapter and systems with a dedicated graphics card have a 90Watt adapter.
Updated AC adapter part numbers:
613149-001–65-W AC adapter for use with computers with UMA graphics
613150-001–90-W AC adapter for use with computers with discrete graphic