Find the multiple of 503

Let's play "Find the multiple of 503!" This is how it works: There is one number in each of the boxes below, but only one of the numbers is a multiple of 503. Without using a calculator, see if you can find the only multiple of 503.

Find the multiple of 504
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Find the Multiple
Do you want to play "Find the Multiple" for a particular number? If so, please enter it below and press "Play."

Multiples of 503
Do you know that there are more multiples of 503 than there are stars in the universe? Go here to learn all about the multiples of 503.