Question

what is the greatest prime you must consider to test whether 7725 is prime

Answer 1

you can use a nifty formula,
we need to check primes less than sqrt 7725

Answer 2

so 87 , is thats a prime

Answer 3

if thats a prime *

Answer 4

of course this number is not prime, its divisible by 5

Answer 5

7725 is non prime.

Answer 6

but if you werent sure///