No, because 8 times 8 equals 64
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Yes, 7 is a factor of 63. The factors of 63 are 1, 3, 7, 9, 21, and 63.
The greatest common factor is 63
No, 63 is not prime.
Since 9 is a factor of 63, all of its factors are common.
63/8 = 63 ÷ 8 = 7.875