12. Grandpa Hua Luogeng was born on November 12, 1910. Arrange these numbers into an integer, and factorize it as 19101112 $=1163 \times 16424$. Are either of the numbers 1163 and 16424 prime? Please explain your reasoning.
【Analysis】According to the concept of composite numbers, it is easy to determine that 16424 is a composite number, and then determine whether 1163 is a prime number, see the solution for the method.

【Solution】Solution: 16424 is a composite number, the reason being that 16424 has more than two divisors, in addition to 1 and itself, it also has 2, 4, etc.
1163 is a prime number, the method of judgment is: $35^{2}=1225, 34^{2}=1156$, the closest to 1163, so using all prime numbers less than 34, $2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31$ to divide 1163, none of them can divide evenly, so it can be determined that 1163 is a prime number.