isprime pypython

from multiprocessing import Process
from random import randint
from time import time
#import numpy as np
x = 0


def isprime(n):
    if n%2==0 or n%3==0 or n%5==0 or n==1: return(False)
    for i in range(7, 10000, 2):
        if n%i==0: return False
    return True


def isprime_ferm(n):
    #if isprime(n):
        for i in range(1):
            a = randint(2,n-1)
            r = a**(n-1)%n
            if r != 1:
                print('neaet')
                return(False)
        print('truae')
        return(True)


def itstimetostop():
    global x
    x = 1

#
# def fnmp(num,s,e):
#     t = time()
#     if s%2==0:
#         s-=1
#     elif s==2: s=3
#
#     np.arange(s, e, 2)
#
#
#     print('                 ', time() - t, 'sec','true')
#

def f(num,s,e):
    t = time()
    if num%2==0:
        print('                 ', time() - t, 'sec', 'false')
        itstimetostop()
        return False

    if s==2:
        s+=1
    elif s%2==0: s-=1

    for i in range(s,e,2):
        if num%i==0:
            itstimetostop()
            break
    itstimetostop()
    print('                 ', time() - t, 'sec','true')


def divide(n, p=4):                                            # p = кол-во потоков
    parts = []
    n = int(n**0.5)
    for i in range(1, p+1):
        part = int(n / p * i)
        parts.append(part)
    return parts



if __name__ == '__main__':
    threads = []
    num = 878761296072214601           #878761296072214601
    print(len(str(num)))
    parts = divide(num)


    for i in range(len(parts)):
        if i != 0:
            s = e
            e = parts[i]
        else:
            s = 2
            e = parts[0]
        p = Process(target=f, args=(num,s,e))
        threads.append(p)
        p.start()
        print(p)

    for pr in threads:
        p.join()
        print(pr)