Is 88 a prime number or a composite. number

All even numbers are composite, so 88 is composite.

Composite! because:
 A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and. Things you cannot divide but only itself... 

A composite is a positive integer that has at least one positive divisor other than one or the number itself. In other words, a composite number is any positive integer greater than one that is not a prime number.