This number is a composite.
The smallest two-digit number N = ab such that the sum and absolute difference of its digits along with the concatenations of each in both directions are all prime. E.g., 5 - 2 = 3, 5 + 2 = 7, 37, and 73 are prime. [Heleen]
25 is the concatenation of 2 and 5 which are the only primes of the form 10n + 2 and 10n + 5. Note that 25 = 52. [Murthy]
Laura Nickel, a high school student when she made international news by codiscovering the 25th Mersenne prime, is now Ariel Glenn.
25^5+52^2 is a 2+5-digit prime. [Silva]
A prime square whose prime count π(5^2) is another prime square (3^2) and it's prime count is another prime square (π(π(5^2)) = 2^2). [Picheny]
The website Prime Rhyme provides 25 words that rhyme with prime.