57
27, 57, 77, yes. 37, 47, 67, no.
57
18
57 is the only one evenly divisible by 19 (or 3) ...and the other three are prime numbers
60.get calculator
27, 57, 77, yes. The rest, no.
37, 41, 43, 47, and 53
25+32=57
40 + 57 + 40 + 30 + 47 + 31 + 60 + 38 + 64 + 30 + 120 = 557
38 +what=57
27, 57 and 77 are composite.