Question

7*11*13+3 is a composite integer

Answer 1

7×11×13+13

taking 13 as common

13 (7×11×1)+1

13 (7×11+1)×1

here it has three factors .So,we can say that it is a composite number.

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Answer 2

A composite number is a positive integer that has a factor other than 1 and itself. Now considering your numbers, 7×11×13+13 may be written as, i.e. 13 * (78). ... So, other than the number and 1, it have 5 and 1009 as it's factors too.