Question

if 7*6*5*4*3*2*1+7 is a composite number justify your ans

Answer 1

7*6*5*4*3*2*1+7 = 7(6*5*4*3*2*1+1).
the expression we can clearly see is divisible by 7 other than 1 and itself .. the no. itself is greater we can see than 7.
hence 7 is a factor
hence the no. is composite.

Answer 2

7*6*5*4*3*2*1+7=5047 it is prime number