Assuming you want a rectangular array, 1 x 18, 2 x 9, or 3 x 6.
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You can only do multiplation so a whole number is divisble by another whole number when the quotient is a whole number and the remainder is 0
Think of the chairs as arrays. The dimensions of the arrays give you the factors of 18.
18 Chairs into equal rows - 6 x 3 2 x 9 18 x 1
You can have: 1 row of 36 2 rows of 18 3 rows of 12 4 rows of 9 or 6 rows of 6, so in total there are 5 ways.
There are 19 ways to do this.