No subscriptions, no paywalls, no catches. It is even, and is the only even prime (the primes other than 2 are called the odd primes). The number two (2) is the second positive integer and the first prime number.
The digit used in the modern western world to represent the number 2 traces its roots back to the indic brahmic script, where 2 was written as two horizontal lines. Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.
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