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7 is a prime factor of 49. Actually, it is the square root.
1 x 98, 2 x 49, 7 x 14, 14 x 7, 49 x 2, 98 x 1 = 98
1, 7, 49 7 is prime.
98 = 1 x 98, 2 x 49, 7 x 14, 14 x 7, 49 x 2, 98 x 1
7 x 7 = 49 7 x 70 = 490 49 + 490 = 539