4225
can be obtained as sum of two square numbers in different ways:
 
4225 = 16^2 + 63^2 = 25^2 + 60^2 = 33^2 + 56^2 = 39^2 + 52^2
 
4225 is square number itself (65^2)
 
 
more interesting 4-digit numbers:  
 
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