Python Unittest How to check if a number is Integer and Not negative?

Question

Python

Let's say I have a function

def isPrime(n):
    '''Check if integer n is a prime'''
    n = abs(int(n))
    if n < 2:
        return False
    if n == 2: 
        return True    
    if not n & 1: 
        return False
    for x in range(3, n):
        if n % x == 0:
            return False
    return True

Which takes n a number, and if that number is prime then returns True or False if not.
Here's an example Unittest code.

import unittest

class PrimeUnityTest(unittest.TestCase):
    def test_Int(self):
        self.assertTrue(isPrime(5.8), 'N is not Integer!')
    def test_neg(self)
        self.assertTrue(isPrime(-2), 'N is Negative Number!')

How to correctly check whether the type of a number is N → Int and not Float, and check the number for negative, what assert methods can be used to do this?

Answer 1

if n > 0 and not n % 2

Answer 2

Sorry for the offtopic, but you can speed up the check if you replace
for x in range(3, n): with
for
x in range(3, round(sqrt(n))):