Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 . . . - Cuemath Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers A composite number is the integers that have factors other than 1 and themselves we can say both are composite The numbers 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers since on simplification the numbers have (2,3,13 and 1) and (5,1009 and 1) as their factors