Question

Why are 7x11x13+13 and 7x6x5x4x3x2x1+5 composite

Answer 1

we have , 7*11*13+13=1001+13 =1014

1014 = 2*3*13*13

so, it's the product of more than two prime numbers

2,3 and 13

hence , it is a composite number

7*6*5*4*3*2*1+5=5040+5=5045

=> it is a product of prime factor 5 and 1009

hence, it is a composite number.
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