It is a whole number, integer, and a rational number. :D
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To any set that contains it! It belongs to {-3.15}, or {-3.15, sqrt(2), pi, -3/7}, or all numbers between -4 and +5, or negative numbers, or rational numbers, or real numbers, or complex numbers, etc.
To any set that contains it! It belongs to {sqrt(30)}, or {45, sqrt(30), pi, -3/7}, or irrational numbers, or real numbers between -6 and 6, or all real numbers or complex numbers, etc.
To any set that contains it! It belongs to {8}, or {8, sqrt(2), pi, -3/7}, or {8, bananas, France, cold} or all whole numbers between 4 and 53, or multiples of 2, or composite numbers, or counting numbers, or integers, or perfect cubes, or rational numbers, or real numbers, or complex numbers, etc.
It belongs to any set which has it as a member.The standard sets that include it are:Negative integer numbers (ℤ⁻)Integer numbers (ℤ)Rational numbers (ℚ)Real numbers (ℝ)Complex numbers (ℂ)Note: ℤ⁻ ⊂ ℤ ⊂ ℚ ⊂ ℝ ⊂ ℂ
To any set that contains it! It belongs to {5.385164807}, or {45, sqrt(2), pi, 5.385164807, -3/7}, or all numbers between 4 and 53, or rational numbers, or real numbers, or complex numbers, etc.