Yes but it does have some editing and metadata management features. Personal opinion is everyone should start with a photo manager and then only use another program if you need more. On Linux Shotwell is another photo manager and Digikam is cross platform. I know my wife uses just Shotwell. She has never needed more. I use Digikam because it is a little more powerful and flexible but less elegant. My wife is into photos... me not as much too.
How extensive of editing are we talking? If you just need some of the more basic features, there is Paint.NET which is surprisingly useful for a lot more than you'd think. Definitely not as feature-rich as Photoshop though.
Another vote for GIMP, though I believe they still don't have full CMYK support yet. VIVA (?) I think has a Photoshop clone, but pretty sure not open source.