Question

Check the weather 6861 is perfect square

Answer 1

Answer:

No

Step-by-step explanation:

Digital roots are 1, 4, 7 or 9. ...

If unit digit ends in 5, ten's digit is always 2.

If it ends in 6, ten's digit is always odd (1, 3, 5, 7, and 9) otherwise it is always even. ...

If a number is divisible by 4, its square leaves a remainder 0 when divided by 8.

you can find by prime factorization  method

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