Maths glossary · New Zealand
Prime number
A whole number greater than 1 with exactly two factors: 1 and itself.
A number with more than two factors is a composite number. The number 1 is neither prime nor composite.
Example: 2, 3, 5, 7, 11 and 13 are prime. 9 is not, because 3 × 3 = 9.
Lessons, worksheets, practice and tools on this: Multiplication and division.
Related words
- Product: The answer when you multiply numbers.
- Quotient: The answer when you divide.
- Factor: A whole number that divides another whole number exactly, with nothing left over.
- Multiple: The result of multiplying a number by a whole number.
- Array: Objects arranged in equal rows and columns.
- Even number: A whole number that can be split into two equal groups with none left over.
- Odd number: A whole number that leaves 1 left over when split into two equal groups.
- Ratio: A comparison of two amounts, written with a colon, the word to, or as a fraction.
- Unit rate: A rate that compares an amount to exactly 1 of something.