2,457 is not prime (so it is composite) because 2,457=3x3x3x7x13
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2457 is a composite number, not a prime. Its factors are 3 x 3 x 3 x 7 x 13.
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
Position of 2.
In todays notation of Roman numerals: MMCDLVII