See what you think.
http://mathforum.org/dr.math/faq/faq.prime.num.html
Can a whole number ending in 8 be prime?
2 answers
No, any whole number ending in 8 will never be prime. A number ending in 8 will always be divisible by 2. The rule for 2 is:
If any number ends in any even number (0, 2, 4, 6, or 8) it will always be divisible by 2 and therefore it is not prime.
There are other rules such as this one that really help when you want to find out whether or not a whole number is prime or not. I've used them ever since I learned them. Hope this helps!
If any number ends in any even number (0, 2, 4, 6, or 8) it will always be divisible by 2 and therefore it is not prime.
There are other rules such as this one that really help when you want to find out whether or not a whole number is prime or not. I've used them ever since I learned them. Hope this helps!