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Answer:
25
Step-by-step explanation:
1 )13431 (11
1
-
-------------
21)34
21
-
_____
226)1331
1356
-
________
-25
so if we add 25 it becomes a perfect square.
13431+25=13456
check
16|13456
29 |841
| 29
13456=4×4×29×29