Approach to solve the problem

#1

Is 961 = 31x31 an CB number. Because it is not divisible by any of the number given above.,

0 and 1 are not a CB number.
2,3,5,7,11,13,17,19,23,29 are CB numbers.

#2

Hi

Maximum cb numbers that be formed from 961 is 1.

#3

Actually, I was asking if the number 961 as a whole is an coding blocks. I got confused CB numbers as prime. But now it is been resolved.
Thanks.