This number is a prime.
The string 9136319 was found at position 9128219 counting from the first digit after the decimal point of Pi. (The leading '3.' is not counted.) Moreover both numbers are two 'consecutive' palindromic primes (palprimes)! Dropping the left substring 91 from the two numbers reveal two other primes 36319 and 28219. Note also the concatenation of 91363 with 28219 yields a prime. [De Geest]