626 = 2 x 313. It is the smallest multidigit, palindromic, two-sided semiprime.
626 has a representation as a sum of two squares: 626 = 12 + 252.
626 is a palindrome in base 5 (10001), base 10 (626), and base 16 (272).
626 is the sum of two nonzero fourth powers: 626 = 54 + 14.
Source: Prime Curios!
Is it not also palindromic in base 25 (1,0,1) and 312 (2,2)?
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