No because they are both composite numbers
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No. Neither one are. 51 = 17 x 3 57 = 19 x 3
57 can be divided by 3 and 19 with no remainder. 51 can be divided by 3 and 17 with no remainder.
53
because it has two or more factors
Half of 51/57 = 51/(57*2) = 51/114 = 0.4474 approx.