What one-digit number is the product of two consecutive prime numbers?
There are only two prime numbers that are consecutive numbers, 2
and 3. Their product is 2 x 3 = 6. The first prime numbers are 2,
3, 5, and 7 and the only two consecutive prime numbers whose
product is a single digit are 2 and 3. (The next two consecutive
prime numbers, 3 and 5, have a two-digit product.)