The factors of 49 are:
1, 7, 49
The factors of 84 are:
1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
The factors of 91 are:
1, 7, 13, 91
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The GCF is 7.The GCF is 7.
The GCF is 7.
Square numbers, like 49, have an odd number of factors.
91
No, as its factors are: 1, 7, 13, 49, 91, 637.