604 = 22 x 151.
604 is a number that cannot be written as a sum of three squares.
604 and the two numbers before it and after it are all products of exactly three primes: 602 = 2 x 7 x 43; 603 = 3 x 3 x 67; 604 = 2 x 2 x 151; 605 = 5 x 11 x 11; 606 = 2 x 3 x 101.
604 is 2444 in base 6 and 424 in base 12.
Source: Prime Curios!
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