diff --git a/src/prime_checker.py b/src/prime_checker.py
new file mode 100644
index 0000000..7758a84
--- /dev/null
+++ b/src/prime_checker.py
@@ -0,0 +1,37 @@
+def is_prime(number: int) -> bool:
+    """
+    Check if the given number is prime.
+    
+    A prime number is a natural number greater than 1 that is only divisible by 1 and itself.
+    
+    Args:
+        number (int): The number to check for primality.
+    
+    Returns:
+        bool: True if the number is prime, False otherwise.
+    
+    Raises:
+        TypeError: If the input is not an integer.
+    """
+    # Check if input is an integer
+    if not isinstance(number, int):
+        raise TypeError("Input must be an integer")
+    
+    # Handle special cases
+    if number < 2:
+        return False
+    
+    # Optimize for small numbers
+    if number == 2:
+        return True
+    
+    # Even numbers greater than 2 are not prime
+    if number % 2 == 0:
+        return False
+    
+    # Check odd divisors up to the square root of the number
+    for divisor in range(3, int(number**0.5) + 1, 2):
+        if number % divisor == 0:
+            return False
+    
+    return True
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diff --git a/tests/test_prime_checker.py b/tests/test_prime_checker.py
new file mode 100644
index 0000000..6a0da4f
--- /dev/null
+++ b/tests/test_prime_checker.py
@@ -0,0 +1,39 @@
+import pytest
+from src.prime_checker import is_prime
+
+def test_prime_numbers():
+    """Test known prime numbers."""
+    prime_numbers = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]
+    for num in prime_numbers:
+        assert is_prime(num) is True, f"{num} should be prime"
+
+def test_non_prime_numbers():
+    """Test known non-prime numbers."""
+    non_prime_numbers = [0, 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22]
+    for num in non_prime_numbers:
+        assert is_prime(num) is False, f"{num} should not be prime"
+
+def test_large_prime():
+    """Test a large prime number."""
+    assert is_prime(104729) is True, "104729 is a large prime number"
+
+def test_large_non_prime():
+    """Test a large non-prime number."""
+    assert is_prime(100000) is False, "100000 should not be prime"
+
+def test_negative_numbers():
+    """Test negative numbers."""
+    negative_numbers = [-1, -2, -3, -5, -7]
+    for num in negative_numbers:
+        assert is_prime(num) is False, f"{num} should not be prime"
+
+def test_error_handling():
+    """Test error handling for invalid input types."""
+    with pytest.raises(TypeError):
+        is_prime(3.14)
+    
+    with pytest.raises(TypeError):
+        is_prime("17")
+    
+    with pytest.raises(TypeError):
+        is_prime(None)
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