The product of two prime numbers must be______ ．

The product of two prime numbers must be______ ．

Prime x prime = product. The product is a multiple of two prime numbers. These two prime numbers are also the factors of the product. In this way, the factor of the product has these two prime numbers besides 1 and itself, so their product must be a composite number. So the answer is: composite number

The product of two prime numbers must be______ ．

Prime x prime = product. The product is a multiple of two prime numbers. These two prime numbers are also the factors of the product. In this way, the factor of the product has these two prime numbers besides 1 and itself, so their product must be a composite number. So the answer is: composite number

The sum of any two prime numbers must be ()
A. Even B. prime C. composite D. indeterminate

Because all prime numbers except 2 are odd, the sum of two odd numbers is even, 2 plus any prime number (not 2) is not even, so a, B and C can be excluded, so D is chosen