Create a function that takes a list and returns a new list containing only prime numbers.
filter_primes([7, 9, 3, 9, 10, 11, 27]) ➞ [7, 3, 11]
filter_primes([10007, 1009, 1007, 27, 147, 77, 1001, 70]) ➞ [10007, 1009]
filter_primes([1009, 10, 10, 10, 3, 33, 9, 4, 1, 61, 63, 69, 1087, 1091, 1093, 1097]) ➞ [1009, 3, 61, 1087, 1091, 1093, 1097]