The numbers 53, 59, 61, 67, 71 and 73 are prime.
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The prime factors of 53 are 1 and 53, as 53 is a prime number itself. The prime factors of 74 are 1, 2, 37, and 74. Prime numbers are numbers greater than 1 that have no positive divisors other than 1 and themselves.
31*43 = 74
2 x 37 = 74
53, 57, 59, 61, 67, 71, 73
74.