Noun classPrefix6a-ma-7e-ki-8e-bi-9e-N-

Which prefix means out of or from?

Ex- is a prefix that means “out, out of, from.”

Is the preposition out?

In American English and spoken British English out itself is commonly used as a preposition, but many British people consider that this use is not correct: I looked out the window. Dr Hammond’s out just now, visiting a patient.