On dividing a number by 5. we get 3 as remainder. What will the remainder when the square of this number is divided by 5?

On dividing a number by 5. we get 3 as remainder. What will the remainder when the square of this number is divided by 5? Correct Answer 4

Let, the number = PP = 5*1+3 = 5+3 = 8 (at least, P can be divided by 1)Now, square of 8 = 6464 = 5*12+4So, the remainder is 4 (Ans) 
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