This one made me pause too. I think the quiz considers whole numbers to be the positive integers.

Technically, a prime number is a positive integer which is only divisible by 1 and itself. One would have to expand the definition if one admitted negative integers, since -7 would be divisible by 1, -1, 7, & -7.

The definition of of prime numbers is expanded for other numerical domains (and there is a lot of domains), so expanding the definition of prime numbers to the negative numbers would no big deal except it makes elementary number theory more difficult to work with.

## 3 Comments:

Well I got 10 out of 10, but there was a trick question:

-7 is

* Irrational

* An integer

* A whole number

* A prime number

In fact -7 is an integer, a whole number and a prime number. The survey would only accept "an integer" as the correct answer.

Am I missing something?

epm,

This one made me pause too. I think the quiz considers whole numbers to be the positive integers.

Technically, a prime number is a positive integer which is only divisible by 1 and itself.

One would have to expand the definition if one admitted negative integers, since -7 would be divisible by 1, -1, 7, & -7.

The definition of of prime numbers is expanded for other numerical domains (and there is a lot of domains), so expanding the definition of prime numbers to the negative numbers would no big deal except it makes elementary number theory more difficult to work with.

One would have to expand the definition if one admitted negative integers, since -7 would be divisible by 1, -1, 7, & -7.D'oh! But of course... Damn, how embarrassing!

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