The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
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It s factors are: 1, 7 and 49
4, 5 5, 6 6, 7 7, 8 8, 9 9, 10
Yes, all factors come in pairs. If you divide one into a number, the other is the result.
There is an infinity of pairs of numbers with a GCF of 4. If p and P are two distinct primes, then 4p and 4P are such a pair. There are other ways to construct such pairs, but one infinity should suffice.
The factor pairs of 51 are (1,51) and (17,3)