2457 is a composite number, not a prime. Its factors are 3 x 3 x 3 x 7 x 13.
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2,457 is not prime (so it is composite) because 2,457=3x3x3x7x13
In todays notation of Roman numerals: MMCDLVII
2457
To work it out you'll need to break it down by halving it, by 3's, 5's, 7's etc... until you can't break it down no more. Your final answer should consist of 2x2x3x7 etc... and when you times them all together you should get 2457.
2457