Question

7×11×13+13is a composite number why ​

Answer 1

Step-by-step explanation:

Take 13 Common

13(7*11+1)

13(78)

13(13*2*3)

Hence this number has more than 2 numbers as factors

Hence it is a composite number

Answer 2

Because it is being multiplied by 3 numbers

and a prime no doesn't have more than 2 multiples i.e. 1 and itself.

Also 13 is added and 13 is also multiple so still it will be divisional by 13.

Hope it helps........