For every play the artist receives royalties. There is no fixed amount, how much the artist receives for every play. It depends on various factors, but mainly from which countries the streams come from and whether the listener has a free or paid subscription.
Spotify Premium is cheaper in Asia or Africa like in Europe or North America. In India the monthly subscription costs around $1.60, where in Denmark the same subscription costs $14.50.
For this reason, there are huge differences in how much you get for every stream. In the following chart you see how much you get on average on each store:
You will find more infographics at Statista