How can I identify prime numbers easily?
1 Answer
Apr 8, 2016
There is no easy way with large numbers.
- List item
Explanation:
But you can exclude a lot of numbers by using the divisability rules:
- if it's even it's not a prime (only 2 is a prime)
- if the digits add up to a multiple of three, it's not a prime
- if it ends in 5 it's not a prime
And so on.
