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number properties

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number properties

by sud21 » Thu Jan 12, 2012 9:39 am
Integer K and N, is K a prime number?
1). Besides 1, K is the least factor of N.
2). K has two factors.
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Source: — Data Sufficiency |
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by mankey » Thu Jan 12, 2012 9:53 am
Is it A?

First is sufficient, since the least factor will be prime, if it is not 1.

Second is not sufficient since it is not given if K is positive or not; Prime number has to be a positive number.

Thanks.
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by sud21 » Fri Jan 13, 2012 11:17 am
mankey wrote:Is it A?

First is sufficient, since the least factor will be prime, if it is not 1.

Second is not sufficient since it is not given if K is positive or not; Prime number has to be a positive number.

Thanks.
If we consider K and N to be positive integers then here K has 2 factors, and only prime numbers have 1 and itself as factors.

Answer is D.
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