Question

Show that 5 x 7 x 11 x 13 + 55 is a composite number.

Answer 1

Composite number: A whole number that can be divided exactly by numbers other than 1 or itself.

5 x 7 x 11 x 13 + 55

5 (1 x 7 × 11 x 13 +11)

5 × 11 (91 +1)

5 × 11 (92)

5 × 11 (2² × 23)

5 × 11 × 2 × 2 × 23

So, given number is the composite number because it is the product of more than one prime numbers.