the 17th century
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Yes,the number 1609 is a prime number.
1 mile = 1609 meters 400 meters = 400/1609 miles ~ one fourth mile
1 mile = 1609 metres (approx) so 50 metres = 50/1609 = 0.03108 miles, approx.
A mile is arpprox 1609 metres!
sqrt(1609) = 41.11 approx.