The product of the greatest and least two-digit prime numbers is 1,067.
97 is the greatest two-digit prime number (98 and 99 are composite and they are the greatest two-digit numbers), and 11 is the least (10 is the smallest two-digit number, but it is composite). 97x11=1,067, so the product of the greatest and least two-digit prime numbers is 1,067.
Hope I helped! ;)
