Which of the following numbers is a prime number
Note
59 has no divisors other than 1 and itself, so it is prime; the other choices are divisible by smaller integers (51 by 3, 57 by 3, 63 by 3).
Which of the following numbers is a prime number
59 has no divisors other than 1 and itself, so it is prime; the other choices are divisible by smaller integers (51 by 3, 57 by 3, 63 by 3).