77,777,400,996

Number
$77 \, 777 \, 400 \, 996$ is:
 * $2^2 \times 3^2 \times 53^2 \times 877^2$

The $278 \, 886$th square number:
 * $77 \, 777 \, 400 \, 996 = 278 \, 886 \times 278 \, 886$


 * Starts with a remarkably long string of $7$s. Nothing to see here, move along now.