write a recursive function that takes and integer and returns "True' if all of its digits are prime numbers

write a recursive function that takes and integer and returns "True' if
all of its digits are prime numbers

References

Reference NO 1

http://stackoverflow.com/questions/15188165/write-a-recursive-function-that-takes-and-integer-and-returns-true-if-all-of-i

Reference NO 2

http://stackoverflow.com/questions/12529279/use-recursion-to-get-number-of-digits-in-an-integer

Reference NO 3

http://my.safaribooksonline.com/book/programming/cplusplus/9780132777650/functions-and-an-introduction-to-recursion/ch06lev1sec26

Reference NO 4

http://www.kosbie.net/cmu/fall-10/15-110/koz/final-review/ProblemSet.doc

Reference NO 5

http://cs-people.bu.edu/lapets/resource/plproblems.pdf

Reference NO 6

http://www.lutz-dietrich.de/mitsch/java/weitereAufgaben6.htm

Reference NO 7

http://vulms.vu.edu.pk/others/students/c++/pages/chepter3.html

Reference NO 8

#EANF#