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The prime number that comes before 47 is 43. 45 is divisible by 1,3,5,9,15, and 45. 43 only has 1 and 43 as factors.
41
47
Of these, 45 is the only composite number. All the others are prime.
41: 1, 41 42: 1, 2, 3, 6, 7, 14, 21, 42 43: 1, 43 44: 1, 2, 4, 11, 22, 44 45: 1, 3, 5, 9, 15, 45 46: 1, 2, 23, 46 47: 1, 47 41: 41 42: 2, 3, 7 43: 43 44: 2, 11 45: 3, 5 46: 2, 23 47: 47