Explanation:

- The sequence given is: 1, 4, 36, 900, 441103.

- This sequence doesn't follow any typical arithmetic or geometric pattern.

- Let's explore possible patterns:

- 1: $1^2=1$

- 4: $2^2=4$

- 36: $6^2=36$

- 900: Is ${30}^2=900$

- 441103: This number seems out of pattern, as it's not a square of any integer.

- All numbers except 441103 are perfect squares.

The correct answer is Option 2: 441103.