A and B are prime numbers. The product of AB must be () A. Prime B. even C. composite D. undetermined

A and B are prime numbers. The product of AB must be () A. Prime B. even C. composite D. undetermined

Because all prime numbers except 2 are odd, because odd × odd = odd, odd × even = even, the product of two prime numbers may be even or odd. If a and B are both prime numbers, then the factor of the product of AB is a and B besides 1 and itself, so their product must be composite