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prime numbers
What is a Prime Number?  A Prime number is a
whole number that has two factors, one and itself,
Example: 5 is a prime number because the only
number you can multiply to get to five is 1.  
1 x 5 =5
Factor?  Factors are the numbers you multiply together to get another
number:  
Example1:  1 and 5 are factors of 5  1x5=5 example2: 3 and 4
are factors of 12  3x4=12