No, "de" is not a prefix in English. It is often found in words borrowed from other languages such as Latin, French, or Spanish. It can function as a part of a word but is not considered a prefix in English.
de is the prefix
The prefix is de-. This prefix means away from.
The prefix for depot is "de-".
The prefix of "gain" is "de-".
The prefix for descend is "de-".
de is the prefix
The prefix is de-. This prefix means away from.
the prefix is de-
The prefix is de-. This prefix means down.
The prefix de- means away. Another word with this prefix is detach.
The prefix for depot is "de-".
The prefix for "tend" is "de-".
The prefix of "dense" is "de-".
The prefix for "tension" is "de-".
The prefix for "demeanor" is "de-".
The prefix of "developed" is "de-".
The prefix for descend is "de-".