Prime Numbers and Composite Numbers
Note: This is only about whole numbers (integers)
greater than 1
In other words: 2,3,4,5,6,7,8,9,10,11,12,... etc
A Prime Number can be
divided evenly only by 1, or itself.
A Composite Number can
be divided evenly by numbers other than 1 or itself.
(So, any whole number greater than 1 is either prime or composite)
Examples
|
Number
|
Can be Evenly
Divided By
|
Prime, or
Composite?
|
|
1
|
(1 is not considered prime or composite)
|
|
2
|
1,2
|
Prime
|
|
3
|
1,3
|
Prime
|
|
4
|
1,2,4
|
Composite
|
|
5
|
1,5
|
Prime
|
|
6
|
1,2,3,6
|
Composite
|
|
7
|
1,7
|
Prime
|
|
8
|
1,2,4,8
|
Composite
|
|
9
|
1,3,9
|
Composite
|
|
10
|
1,2,5,10
|
Composite
|
Factors
"Factors" are the numbers you multiply to get another
number:
Some numbers can be factored in many ways:
If there is only one way to factor a number, it is a prime number;
if there are many ways it is a composite number.
|
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