3 x 3 x 5 = 45
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As a product of its prime factors: 3*3*5 = 45 or as 32*5 = 45
3 x 3 x 5 = 45
73 is a prime number, but 45 is not a prime number.
45 is NOT a prime number.
15 is a factor of 45, but it is not a prime number.