9889

This number is a composite.

The only 2-sphenic palindrome composite-digit number, i.e., 9889 = 11 x 29 x 31. Note that a concatenation of its prime factors, (11, 31, 29), is also a 2-sphenic number, i.e., 113129 = 29 × 47 × 83. [Loungrides]