3^2 x 5
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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.
No, 45 is not a prime number. It is a composite number. A prime number can only be divided by 1 and itself. 45 can also be divided by 3, 5, 9, and 15.
3 is one of the prime numbers of 45.