Il numero romano MCCCXCVIII nel sistema decimale vale: 1398.
MCCCXCVIII in latino si scrive mille trecenti nonaginta octo,
mentre in italiano milletrecentonovantotto.
MCCCLXXIX, MCCCLXXX, MCCCLXXXI, MCCCLXXXII, MCCCLXXXIII, MCCCLXXXIV, MCCCLXXXV, MCCCLXXXVI, MCCCLXXXVII, MCCCLXXXVIII, MCCCLXXXIX, MCCCXC, MCCCXCI, MCCCXCII, MCCCXCIII, MCCCXCIV, MCCCXCV, MCCCXCVI, MCCCXCVII, MCCCXCIX, MCD, MCDI, MCDII, MCDIII, MCDIV, MCDV, MCDVI, MCDVII, MCDVIII, MCDIX, MCDX, MCDXI, MCDXII, MCDXIII, MCDXIV, MCDXV, MCDXVI, MCDXVII