Are you talking about square stepping stones, or painting squares on a concrete pad? Inside or outside?
Check out my post on painting concrete patio. In that post I explain how easy it is to paint cement using a Sherwin Williams paint. Even though it is about a patio, you could totally do the same thing with whatever cement squares you are referencing. https://karupp-did.net/patio_painted/
Sylvia: Maybe this will help
We painted our front steps that are concrete! Here is my tutorial: https://www.aratariathome.com/blog/how-to-update-concrete-steps