import shutil


def should_use_pigz(processes: int) -> bool:
    """
    Decides whether pigz should be used for gzip decompression. If multiple processes are used and pigz is installed,
    the function evaluates true.

    :param processes: the number of processes to use for decompression
    :return: a boolean indicating if pigz should be used

    """
    return bool(processes > 1 and shutil.which("pigz"))