Yes
check:
the sum of the two length sides > the 3rd length side
the difference of the two length sides < the 3rd length side
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divide the number of sides by 171
40 sides
no, these are the first 20 triangle numbers: 1 3 6 10 15 21 28 36 45 55 66 78 91 105 120 136 153 171 190 210
The interior angle of a regular polygon with x sides is 180(x-2)/x. Rearranging the formula for x, the number of sides for a shape with y angles is 360/(180-y). From this formula, the number of sides is 40.
109/171 = 109 ÷ 171 = 0.6374