126 is a composite number because it has factors other than 1 and itself. It is not a prime number. Negative numbers are not prime numbers The 24 factors of 126 are ±1, &
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It is: 126.
http://wiki.answers.com/Q/What_is_the_LCM_for_42_a...

The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF) Keep in mind that these different terms all refer to the same
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The GCF is 42.
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