I believe it's just onboard graphics?
https

/www.cnet.com/products/dell-inspiron-5559-15-6-core-i5-6200u-6-gb-ram-1-tb-hdd-english/specs/
HD520..... so not likely to be great.
The minimum GPU is a 9800GT, and the HD520 is a bit better than that..... so should be playable, at least on low settings/lower resolutions.
Not going to be the greatest gaming experience ever, but "playable" IMO