Star cluster? - nope, another LSB galaxy

https://www.legacysurvey.org//viewer/?ra=243.4464&dec=54.3685&layer=hsc-dr2&zoom=13

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That is KKR25, a LSB galaxy. Lovely find! I wonder if amateurs could be able to image it…

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Might be difficult with that foreground star. For reference, if you flip over to the SDSS layer, those images were taken with a 2.5-meter telescope with ~60-second exposures per band.

How large does a star cluster need to be for it to be classified as a galaxy, I wonder?
Are these specks of light actually individual stars or star clusters?