A perfect cube is a number that can be expressed as the cube of an integer. This means that if you multiply a whole number by itself twice, the result is a perfect cube. For example, 2 cubed (2 × 2 × 2) equals 8, making 8 a perfect cube. Other examples include 1 (1³), 27 (3³), and 64 (4³). Perfect cubes can be identified in a sequence, where each number is the cube of its position in the sequence. The first few perfect cubes are 1, 8, 27, 64, and 125. These numbers have unique properties in mathematics and are often used in various applications, including geometry and algebra.