Would you capitalize “prime minister” before a name?

Yes, you would.

Explanation:

Prime Minister is a title. Other titles like this include President, King, etc. Titles like these are capitalize. You capitalize the king in King Henry VIII or you capitalize president is President Trump. You would do the same with prime minister. For example, you would say Prime Minister Johnson.

Have a wonderful day! :D

each morning i wrote my name

on the dusty cabinet, then crossed

the dining table in script, scrawled

in capitals on the backs of chairs,

practicing signatures like scales

while mother followed squirting

linseed from a burping can