No, number 59 is not a composite number.
Fifty-nine is not a composite number, because it's only divisors are one and itself.
Yes the number 59 is a prime number.
What Are The Prime Factors Of Fifty-nine?
Prime factors of 59: 1 * 59
About Number 5. Integers with a last digit as a zero or a five in the decimal system are divisible by five. Five is a prime number. All odd multiples of five border again with the five (all even with zero). The fifth number of the Fibonacci sequence is a five. Five is also the smallest prime number that is the sum of all other primes which are smaller than themselves. The Five is a Fermat prime: 5 = 2 ^ {2 ^ 1} +1 and the smallest Wilson prime. Number five is a bell number (sequence A000110 in OEIS). There are exactly five platonic bodies. There are exactly five tetrominoes.