Question

justify whether ( 7×11×13×13 ) is composite number​

Answer 1

$=(7 \times 11 \times 13 + 13) \\ = 13(7 \times 11 \times 1 + 1) \\ = 13(77 + 1) \\ = 13 \times 78 \\ = 13 \times 2 \times 3 \times 13$

Since the number can be expressed as the product of primes.

THEREFORE,

By Fundamental theory of arithmetic (7×11×13+13) is a composite number.

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