i have two answers:
100+25+16+9=150
16+4+121+9=150
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No, but only in the case of the number 1 (12=1) are square numbers odd.
Every square number (except 1) is composite. Prime numbers only have two factors, one and the numbers themselves. Since square numbers also have at least the square roots as factors, they have to be composite.
The factors of 18 are 1, 2, 3, 6, 9, and 18. The only square number of those numbers is 9.
4x4x3+2
No, not all square roots are rational numbers. A rational number is a number that can be expressed as a fraction where the numerator and denominator are integers and the denominator is not zero. Square roots that are perfect squares, such as √4 or √9, are rational numbers because they can be expressed as whole numbers. However, square roots of non-perfect squares, such as √2 or √3, are irrational numbers because they cannot be expressed as a simple fraction.