Prime magic squares. Set by Peter Rowlett. A magic square is an arrangement of numbers where all rows, columns and diagonals ...

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 ...

Most numbers have an even number of factors; however, a square number has an odd number of factors. A prime number has only two factors - the number itself and 1. Square numbers are formed by ...