Is it a 6th gen?>>

Yes.

how do tell what gen it is?>>

Body style. Honda generally keeps the same body design for 4-5 years. 1998 was the Accord's 6th major redesign since it's 1976 debut, marking the 1998-2002 the 6th generation.

Ya'll call the motors names like F22, F23, H23(or semothing like that) what is that and what does mine have>>>

Engine series and liter size. an F22 is a 2.2, F23 a 2.3 liter and so on and so forth. An H22 and F22 are the same liter size, but of a different series/family.

Your car has an F23. 2.3 liter I4 F-series engine.