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Suggest two different methods of knowing if a given integer is prime and analyze them?
Wiki User
∙ 8y ago
With exception of '2' all prime numbers are odd.
Any odd number that ends in '5' is not a prime.
Any number that ends in 0,2,4,6,8 are even and not primes.
'9' is a composite number and not a prime.
So you are left with 3 or 7 , which are primes.
So taking a number , say '23' divide by '3' leaves a remainder of '2' so it is a prime. Similarly '23' divided by '7' leaves a remainder of '2' so 23 is a prime.
If No remainder is left then the number is composite and not a prime.
e.g.
4567 is it a prime ?
Its odd so could be a prime
Does it divide by '3' answer 1522 remainder '1' so it is a prime.
Try '7' answer 652 remainder '3' it is a prime.
Hence 4567 is a definite Prime number.
lenpollock
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