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A number with exactly two factors is a prime number. Some examples are 2, 3, and 11. Note that 1 is not a prime number because it has one factor (1). Also, 0 is not prime because it has infinitely many factors (1, 2, 3, 4, 5, ...).
It depends on the number of variables and their nature: 2 variables, both independent: either axis 2 variables, one independent: x-axis 3 variables, all independent: any axis 3 variables, 2 independent: x or y-axis. 3 variables, 1 independent: x-axis. and so on.
The factors of 81 are numbers that can be multiplied together to give 81. The factors of 81 are 1, 3, 9, 27, and 81. Prime factors are the factors that are prime numbers. The prime factors of 81 are 3 and 3, or written as 3^4.
The factors of 339 are 1, 3, 113, and 339. The prime factors of 339 are 3 x 113.