64 is both a perfect square (64 = 8 × 8) and a cube. (64 = 4 × 4 × 4). 8 has four factors, 8, 4, 2 and 1. It is a composite number and also a cube number: 8 = 2 × 2 × 2. 16 has five factors ...

45 = 5 \times 9\) and so is not prime. 43 is prime as the only factors of 43 are 1 and 43. The first square number is 1 because \(1 \times 1 = 1\). The second square number is 4 because \(2 \times ...