numerology
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The study of numbers is known as Numerology.
the study of a number is numeral
i think they are called negative numbers.
The numbers 1, 2, 3, 4, 5.... are called the natural numbers, or sometimes, the counting numbers.
They are called irrational numbers; numbers that can be expressed as a ratio of integers are called rational numbers. Some common irrational numbers are pi (3.14159...) and the square root of two.