Check if $7396$ is the square of an odd number.

Check if $8649$ is the square of an odd number.

Check if $4225$ is the square of an odd number.

Without adding, find the value of $(1+3+5+7+9+11+13)$.

Without adding, find the value of $(1+3+5+7+9+11+13+15+17+19)$.

Without adding, find the value of $(1+3+5+7+9+11+13+15+17+19+21+23)$.

Express$81$as the sum of $9$odd numbers

Express $100$ as the sum of $10$ odd numbers

Write a Pythagorean triplet whose smallest member is $6$.