If you're talking about submitting it as microstock, it's probably too small to even think about. Yes, you can resample an image to make it larger BUT only to a certain limited extent, depending on what you intend to do with it. I will admit that in a very few cases I have resized an image to meet an agency's arbitrary minimum size requirements, had it approved and even sold BUT I did so carefully, with images that had sufficient quality to begin with, and were already close to the needed size. And even so, I can't recommend it, and no doubt others will jump in here and warn against it.