Il numero 1998, millenovecentonovantotto in Italiano, in Inglese si dice one thousand nine hundred ninety-eight.
Il numero ordinale 1998° in inglese si dice one thousand nine hundred ninety-eighth.
1989: one thousand nine hundred eighty-nine
1990: one thousand nine hundred ninety
1991: one thousand nine hundred ninety-one
1992: one thousand nine hundred ninety-two
1993: one thousand nine hundred ninety-three
1994: one thousand nine hundred ninety-four
1995: one thousand nine hundred ninety-five
1996: one thousand nine hundred ninety-six
1997: one thousand nine hundred ninety-seven
1999: one thousand nine hundred ninety-nine
2000: two thousand
2001: two thousand one
2002: two thousand two
2003: two thousand three
2004: two thousand four
2005: two thousand five
2006: two thousand six
2007: two thousand seven