2006-07-18 16:27:24 · 9 answers · asked by scorpious 1 in Education & Reference ➔ Homework Help
A prime number can be divided without a remainder, only by itself and the number one (1)
Now you can go figure it out. It's easier.
2006-07-18 17:00:35 · answer #1 · answered by leathersammie 4 · 0⤊ 0⤋
87 is not prime. It can be divided by 3.
You can do some quick checks to eliminate non-primes.
1. Anything ending in an even number is definitely not prime.
2. Anything ending with 5 is definitely not prime.
Someone else may have more guides to eliminate non-primes, or check that the number definitely is a prime.
Generally, I find that for the first couple of hundred numbers, you can check them by dividing by the first few prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.
I suppose you could also just look for a list on the net. www.prime-numbers.org is a good source.
2006-07-18 16:53:28 · answer #2 · answered by JT 1 · 0⤊ 0⤋
73, 79, 83 are prime numbers but 87 is not a prime number
2006-07-18 18:00:56 · answer #3 · answered by babygirl11 1 · 0⤊ 0⤋
A prime number is a number that can only be divided by 1 and itself.
So your answer is 87, cos 87 can be divided by eithier 3, 1, 29.
2006-07-18 18:29:04 · answer #4 · answered by isz_rossi 3 · 0⤊ 0⤋
see,my other friends are misguiding u.they r right that 73,79,83 r prime numbers but 87 gets divides by 3 so it is not a prime number.but my friend 2 is also a prime number.so,keep one thing in mind the number that doesn't get divided by any number is a prime number.
2006-07-18 16:42:47 · answer #5 · answered by pratsi 1 · 0⤊ 0⤋
73, 83, 79 are prime numbers.
87 is not, it can be divided by 3.
2006-07-18 16:31:52 · answer #6 · answered by .::G.U::. 1 · 0⤊ 0⤋
87
2006-07-18 16:31:37 · answer #7 · answered by Mike 4 · 0⤊ 0⤋
87/3=29
So 87 is not a prime number.
2006-07-18 16:31:05 · answer #8 · answered by cat_Rett_98 4 · 0⤊ 0⤋
87
the rule:
if the sum of divisions is divided by 3, whole number is divided by 3
2006-07-18 16:32:48 · answer #9 · answered by Anonymous · 0⤊ 0⤋