Trollathon #2.12 : Primetime

Converting the second to decimal and multiply $751$ and $340397087$ we get the three numbers

$314 926 584 752$

$568 424 235 712$

$255 638 212 337$

Now, substitute every prime by 1, and the others by 0. Looking at the number 3-digit at a time, we get

$100$ $010$ $100$ $111$

$100$ $010$ $111$ $101$

$111$ $010$ $101$ $111$

Now looking at this upside down and trace all the ones, we see that it forms "0417", so the answer is $\boxed{417}$ .