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The lowest two prime numbers are: 2 & 3.
Both 3 and 5 are prime numbers. 3 x 5 = 15
Yes, 64 can be a product of prime numbers. All integers are either prime numbers or a product of prime numbers (called the prime factorization of a number). The prime factorization of 64 is 2 x 2 x 2 x 2 x 2 x 2.
1 and 2
It is impossible for the product of two prime numbers to be prime. It is impossible for the sum of two prime numbers to be prime as long as one of the numbers isn't 2.