57 can be divided by 3 and 19 with no remainder.
51 can be divided by 3 and 17 with no remainder.
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No because they are both composite numbers
No. Neither one are. 51 = 17 x 3 57 = 19 x 3
because it has two or more factors
(51+57)/2 = 54
Yes; they are 51, 53, 57, 59.