Supercharge your learning!

Use adaptive quiz-based learning to study this topic faster and more effectively.

Prime number

A prime number is a positive integer that has no factors apart from one and itself. $$1$$ is not considered to be a prime number.

$$2$$, $$3$$ and $$5$$ are prime numbers.

$$6$$ is not a prime number because it has factors $$2$$ and $$3$$.

There are infinitely many prime numbers. The first ones are

$$$2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,\dots$$$
These cicadas hatch in a 17 year lifecycle - a prime number. This means that predator lifecycles are less likely to overlap, and so more cicadas survive.
These cicadas hatch in a 17 year lifecycle - a prime number. This means that predator lifecycles are less likely to overlap, and so more cicadas survive.