538

Number
$538$ (five hundred and thirty-eight) is:


 * $2 \times 269$


 * The $3$rd positive integer after $38$, $462$ whose square ends in $444$:
 * $538^2 = \left({500 + 38}\right)^2 = \left({250 + 38}\right) \times 1000 + 1444 = 289 \, 144$