No, ab is not the prefix for about. This is a common mistake. The prefix is a- which means to or toward.
ab for example ab-normal
Ab is the prefix
The prefix of "absorbent" is "ab-".
The prefix for absent is "ab-".
The prefix of "abandon" is "ab-".
Ab
Mal + Ab
super
The prefix word for abomination is "anti-."
ab- abnormal
The prefix of "down" is "de-" while the prefix of "away" is "a-" or "ab-" and the prefix of "from" is "fro-" or "fr-" depending on the word.
The prefix of "abolitionists" is "ab-" which means "away from" or "against."