What is the least prime number which is the sum of two distinct positive perfect squares?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the least prime number which is the sum of two distinct positive perfect squares?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
What is the least prime number which is the sum of two distinct positive perfect squares?
train