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Prime Note Clarification

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Prime Note Clarification  [#permalink]

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New post 10 Jul 2015, 13:18
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Hey Guys,

I appreciate the forum; this has been a big help, thus far; I was wondering if someone can clarify this Prime Number Statement for the "GMAT Club Math Book"

A number "n>1" is prime if it cannot be written as a product of two factors "a" and "b" , both of which are greater than
1: n = ab. An example would be nice.

Thanks
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Re: Prime Note Clarification  [#permalink]

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New post 10 Jul 2015, 14:09
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Hi eandre01,

Prime numbers are any positive integers that do NOT have factors other than themselves and the number 1.

The first several prime numbers are... 2, 3, 5, 7, 11, 13, 17, 19

2 is a noteworthy prime number because it's the ONLY EVEN prime number (and it's the smallest).

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Re: Prime Note Clarification  [#permalink]

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New post 11 Jul 2015, 06:19
A prime number is a number that is divisible by itself and 1, meaning it has 2 factors

2 -- 1 and 2
3 -- 1 and 3
5 -- 1 and 5
7 -- 1 and 7
11 -- 1 and 11


You should see the picture by now. Important to note that 1 is not prime (only 1 factor) and 2 is the only even prime (every other even number is divisible by 2).
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Re: Prime Note Clarification  [#permalink]

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New post 14 Jul 2015, 01:50
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eandre01 wrote:
Hey Guys,

I appreciate the forum; this has been a big help, thus far; I was wondering if someone can clarify this Prime Number Statement for the "GMAT Club Math Book"

A number "n>1" is prime if it cannot be written as a product of two factors "a" and "b" , both of which are greater than
1: n = ab. An example would be nice.

Thanks


Can you write 20 as the product of factors both of which are greater than 1?
Yes. 2*10 or 4*5

How about 21?
Yes. 3*7

How about 23?
??
??
No? If no, then 23 is prime!

Basically, a prime number has NO factors other than 1 and itself so you CANNOT write it as product of 2 factors other than as 1*Number itself.
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Re: Prime Note Clarification  [#permalink]

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New post 29 Jan 2018, 00:18
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Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Prime Note Clarification   [#permalink] 29 Jan 2018, 00:18
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