"один стілець, два стільці, п'ять стільців"
Translation:one chair, two chairs, five chairs
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We used to have three grammatical numbers. Singular, plural and dual (2). So 2 still has its own endings. Moreover, it even has separate forms for masculine and feminine: два хлопчики (2 boys) and дві дівчинки (two girls). Три and чотири also follow that declension pattern for 2, but I'm not sure why
As daguipa pointed out below, it's all explained in the Tips for Numbers' skills.
Use Nom. Sg. when the number ends in один/одна/одне = один стілець
Use Nom. Pl. when the number ends in два/дві, три, чотири = два стільці
Use Gen Pl. for ALL OTHERS = п'ять стільців
Notice that I wrote the numbers with letters instead of using numerals, because I think that makes it clear that 11-14 are not included in the second group, but in the third one (Gen. Pl.). After all, they end with "-надцять", not any of the first and second group sounds (одинадцять, дванадцять, тринадцять, чотирнадцять). Same goes for numbers like 512 or 1714... when in doubt, think of how the numbers sound, and not how they look in numerals.
1st Group: 1, 2141, 180371, etc.
2nd Group: 2, 3, 4, 23, 74, 8662, etc.
3rd Group: 0, 5, 11, 100, 214, 612, 1000... and every other number not included in groups 1 & 2