Question

7 × 11 × 13 + 5 is ______.

Options

• a prime number.

• an odd number.

• a composite number.

• a multiple of 5.

Answer 1

7 × 11 × 13 + 5 is a composite number.

Explanation:

7 × 11 × 13 = 1001,

So, 7 × 11 × 13 + 5 = 1006. 

1006 is even and equals 2 × 503,

So, it has a nontrivial factor and is composite.