Because 3 is a factor of 9. Any number that has a composite number as a factor will also have that number's factors as factors.
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No. 6 has 3 as a factor. 12 has 3 as a factor.
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Oh, what a lovely question! When a number has 6 as a factor, it means it can be divided evenly by 6. If a number can be divided by 6, it must also be divisible by 3 because 6 is made up of 3 multiplied by 2. So, yes, numbers with 6 as a factor will also have 3 as a factor. Just like adding happy little trees to a painting, numbers and their factors work together in harmony.
Because 3 is a factor of 9.
No, 3 is not a factor of 37. Also, 37 is a prime number.