Which number is prime?

51

53

57

63
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2 Answers

51 = 3 * 17 not prime

53 = is prime

57 = 3* 19

63 = 7 * 9 not prime

 

by Level 10 User (55.7k points)

53 is prime, because its only factors are 1 and itself.

 

by

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