A natural number, minus 63 is a square number. Add 26, is also a square number, try to find this natural number

A natural number, minus 63 is a square number. Add 26, is also a square number, try to find this natural number

1999-63 = 1936 is the square of 44
1999 + 26 = 2025 is the square of 45
(the square of 1 2 3 4 5 6 7 8. Is 1 4 9 16 25 36 49 64. The difference between the squares of natural numbers is an arithmetic sequence 3 5 7 9 11 13 15. Just find it according to this rule. The required number minus 63 and plus 26 are both square numbers, so the difference between the two squares is 89.)