assembly prime numbers please!!!!

i need write a procedure that sets the zeroflag if the 32-bit integer passed in the EAX register is prime.
( hint ) A PRIME NUMBER IS EVENLY DIVISIBLE BY ITSELF AND 1. OPTIMISE THE PROGRAMS LOOP TO RUN AS EFFICIENTLY AS POSSIBLE. YOUR PROGRAM SHOULD PROMPT THE USER FOR A NUMBER AND THEN DISPLAY A MESSAGE INDICATING WHETHER OR NOT THE NUMBER IS PRIME. THE PROGRAM SHOULD THEN ASK FOR ANOTHER NUMBER FROM THE USER. CONTINUE THIS LOOP IN THIS FASHION UNTIL THE USER ENTERS PREARRANGED VALUE SUCH AS -1.

please help!!!

Sorry but this sort of looks like an extract from a homework assignment, is it?