Explain whether the number 3x5x13x46+23 is a prime number or a composite number.
3 x 5 x 13 x 46 + 23 is a composite number.
this is because,
3 x 5 x 13 x 46 + 23
= 23 ( 3 x 5 x 13 x 2 + 1)
= 23 ( 390 + 1 )
= 23 x 391 = 8993.
since 8993 is a product of 2 distinct numbers, hence it is a composite number.