Only once - thanks to the unique prime factorisation theorem.
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Yes! 2 times 5 equals 10. 10 times 3 equals 30. So, the prime numbers that multiply together to make 30, are, 2, 3 and 5.
They are: 7 times 13 = 91
43 is a prime number. So, 43 can only be produced as a product of 1 times 43.
They are: 1 times 19 = 19 which is a prime number
They are 1 times 19 = 19 which is a prime number