Payment for photography

My wife does photography on the side and her clients mainly pay her via Venmo. She’s made more than $600 total, I’ve heard that you only need to file the 1099 if you’ve made more than $600 from 1 client specifically. Example, most clients have not paid more than $600. Four clients have paid $615 each. Do we just need to claim the $615x4 on the 1099 form?