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# Based on my school maths and some other references I was

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Senior Manager
Joined: 28 Jun 2007
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Based on my school maths and some other references I was [#permalink]  23 Aug 2007, 07:25
Based on my school maths and some other references I was always of the opinion that 1 is NOT a prime number. But recently I saw an explanation in the OG 11th edition which said that 1 is a prime number. I need to look up the problem number so I can prove it... I will do so later today.

Is this one of those GMAt thinggies where they stick to one particular rule, the reality be damned? Or is 1 really a prime number?
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VP
Joined: 08 Jun 2005
Posts: 1147
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One is not a prime number.

A quote from OG 11 states (page 108) - " A prime number is a positive integer that has exactly two different positive divisor, 1 and itself. The number 1 is not a prime number since it has only one positive divisor.

Last edited by KillerSquirrel on 23 Aug 2007, 09:53, edited 2 times in total.
Senior Manager
Joined: 28 Jun 2007
Posts: 320
Followers: 1

Kudos [?]: 23 [0], given: 0

I will post the question number in the evening. I made a note specifically on the scratch paper I was using, but I forgot to note down the question number.
VP
Joined: 08 Jun 2005
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See my edited post

Director
Joined: 31 Mar 2007
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prime numbers

2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,etc

memorize those
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