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Composite Number
A whole number that has more than two factors

Prime Number
A number that is only divisible by itself and 1

Square Number
Any # of tiles that can make a square

Factor
One of the numbers that are being multiplied to equal a product

Multiple
The numbers you say when skip counting by a certain number

How do you know if a number is divisible by 2?
If it is an EVEN number

How do you know if a number is divisible by 5?
The number has to end with a 0 or a 5.

How do you know if a number is divisible by 10?
The number has to end in a zero.

How do you know if a number is divisible by 3?
The sum of its digits is divisible by 3.
 123
 1 + 2 + 3 = 6
 6 is divisible by 3.

How do you know if a number is divisible by 6?
If the number is divisible by 2 AND by 3!
 126
 126 is an even number (is divisible by 2)
 1 + 2 + 6 = 9 (is divisible by 3)

