Yes, because 7 divides evenly into 42 with no remainder.
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7 and 9 are factors and divisors of 63. 63 is a multiple and product of 7 and 9. 63 is divisible by 7 and 9.
The least common multiple of 7 and 9 is 63. The GCF of 7 and 9 is 1.
7 and 315, respectively.
Since 7 is a factor of 63, it is automatically the GCF.
Because 7 is a factor of 28 and 63 and 7 is a prime number.