prime number
A non-prime number greater than 1 is called a composite number.
What's the longest known sequence of non-prime numbers?
All nonprime numbers less than 100 have a factor that is less than 10.

SMART Vocabulary: related words and phrases

Terms for numbers
-handed
additive inverse
aliquot
common denominator
common factor
common multiple
exponent
fold
fortyfold
fourfold
GCF
hundredfold
reciprocal
recurring
recurring number
remainder
response variable
twentyfold
twofold
weighting