Question

is every quadilateral with four congruent sides a square

Answer 1

No only if it also has all right angles if it doesn't have right angles It is a rombus

Answer 2

No, not every quadrilateral with four congruent sides is a square. A rhombus also has four congruent sides, but it's four angles do not equal ninety degrees, as do the angles in a square. However, in a rhombus the opposite angles are equal and add up to 360 degrees, just like a square.