Did you notice anything weird
about the numbers
13
and 19
in the last section?
There was only one way to get them! So, they each only had two
factors.
When this happens, we call the
number "prime."
|
A prime
number has exactly
two factors:
1
and itself. |
The other numbers that we could get with more than one way are
called " composite."
|
A
composite number has
more than two factors. |
So, if you can find anything else that goes into a number other than
1
and itself, then it's a composite number.
The number
1 is
special. It only has one factor -- just itself! So,
1
is neither prime nor composite.
Continued on the
next
page
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