What are...prime knots?

Goal.
I would like to tell you a bit about my favorite theorems, ideas or concepts in mathematics and why I like them so much.

This time.
What are...prime knots? Or: The prime numbers of knot theory!?

Disclaimer.
Nobody is perfect, and I might have said something silly. If there is any doubt, then please check the references.

Slides.

Knot theory.

Prime knots.

Granny knot.

Knot atlas.

Number of knots.

SnapPy.

Mathematica.

Pictures used.

YouTube and co.