Prime & Composite NumbersATI TEAS 7 cheat sheet

Two factors, or more

10 key facts Reviewed Oct 2026

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Definitions

Prime — exactly two factors, 1 and itself
Composite — more than two factors
1 is neither; 2 is the only even prime

The First Primes

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37

Divisibility Tests

2 — even last digit
3 — digit sum divisible by 3
5 — ends in 0 or 5
10 — ends in 0

Prime Factorization

Break down with a factor tree until every branch is prime
36 = 2² × 3²

Key takeaway

Two factors, or more

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