It is not a cactus at all. It is a Euphorbia, possibly Euphorbia horrida. Do a
search on Euphorbia & you will undoubtedly find it. Take a close look. The
thorns are growing directly out of the stem, not from an areole. That is how
you tell it is not a cactus. Also, I don't know of any cactus with such a
square stem. There are several Euphorbias that do that.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)