How many cells are in prophase on this onion root tip slide?
Hard call on early prophase versus interphase, especially since these are not natural distinctions with discrete boundaries but are used to articulate a continous process.

I'd say you're pretty close, I count six for sure. That includes the one in the top row on the far left that is partially clipped in the photo. One iffy possibility is in the third row just left of the obvious anaphase on the left.

Unless your teacher is far more particular than I was with students, I think you're good to go.