676

Number
$676$ (six hundred and seventy-six) is:
 * $2^2 \times 13^2$


 * The $26$th square number after $1, 4, 9, 16, 25, 36, \ldots, 361, 400, 441, 484, 529, 576, 625$:
 * $676 = 26 \times 26$