Quaternions is an option for PrimeQ which specifies whether factorization should be done over the quaternions.

RightGCD[a, b] gives the greatest common right divisor of the quaternions a and b.

ScalarQ[q] gives True if q is a real numeric quantity and False otherwise.

ToQuaternion[q] transforms q into a Quaternion object if possible.

UnitQuaternionQ[q] gives True if q is a unit quaternion and False otherwise.

Atto is the SI unit prefix denoting 10 -18.

Bit is the fundamental unit of information.

Centi is the SI unit prefix denoting 10 -2.

Deca is the SI unit prefix denoting 10^1.

Deci is the SI unit prefix denoting 1/10.