No. Relative to its volume, the greater the number of sides, the smaller the volume. In the limit, a cylinder (circular prism, with an infinite number of "sides") will have the least surface area.
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It depends on the shape of the base, but yes it has at least 3 triangular faces!(yes)
Yes - if you define an equilateral triangle as one in which at least two sides are equal.
equilateral triangles and isosceles ones
No. A non-convex polygon must have at least one reflex angle (between 180 and 360 degrees). But by equiangularity, all the angles of the polygon would have to be reflex. On a plane surface this is not possible.
An isosceles triangle has at least two congruent sides. An equilateral triangle has three congruent sides. So, an equilateral triangle is a special case of isosceles triangles. Since the equilateral triangle has three congruent sides, it satisfies the conditions of isosceles triangle. So, equilateral triangles are always isosceles triangles. Source: www.icoachmath.com