The palindrome number of any even length can not be prime number

First of all, in the whole discussion, we should exclude a number, that is, 11. 11 is the smallest palindrome number, and it is also a prime number. In addition to this number, as mentioned above, the integral multiple of 11 has a property, that is, the sum of numbers on odd bits = the sum of numbers on even bits

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1. Java for all n values not more than 200, the square of n is the palindrome number with symmetric property The palindrome number is stored in array; Output the number of palindromes in the array
2. How to prove that even palindrome numbers can be divisible by 11? For example, 222442123321, the palindrome number of even digits can be divided by 11,
3. Why is there a palindrome number that can be divided by 11 123321 3546556453 this kind of 12321 does not count only the space as the axis of symmetry, does not count the number as the palindrome number of the axis of symmetry. I accidentally found out why? What's the principle? I heard that people used a high school theorem or something
4. It is proved that the sum of the numbers on each digit of a number divisible by 3 can be divisible by 3
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6. The palindrome number obtained by 69 is () and the palindrome number obtained by 126 is ()
7. Design an algorithm to find out all prime numbers within 50, and the algorithm steps are described in natural language
8. A small experiment is designed to prove the existence of air by using common articles at home
9. How many palindromes are there from one to six digits
10. A four digit palindrome number multiplied by 45 becomes a five digit palindrome number. What is the five digit palindrome number?
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