Is 111 a prime number?

Prime Number Checker
Number

Is 111 a prime or composite number?

Answer

Number 111 is not a Prime

111 = 3 × 37

111 has 4 divisors — 1, 3, 37 and 111; a prime has exactly two: 1 and itself.

Primes up to √111

10² = 100 ≤ 111 < 121 = 11², so it is enough to try primes up to 10

  • ÷2 does not divide
  • ÷3 divides

111 ÷ 3 = 37 — 3 divides 111, so 111 is composite

Nearest primes: 109 and 113

Related Calculations

See Also

Prime numbers list

NumberIs Prime
96No: 2⁵ × 3
97Yes
98No: 2 × 7²
99No: 3² × 11
100No: 2² × 5²
101Yes
102No: 2 × 3 × 17
103Yes
104No: 2³ × 13
105No: 3 × 5 × 7
106No: 2 × 53
107Yes
108No: 2² × 3³
109Yes
110No: 2 × 5 × 11
111No: 3 × 37
112No: 2⁴ × 7
113Yes
114No: 2 × 3 × 19
115No: 5 × 23
117No: 3² × 13
119No: 7 × 17
120No: 2³ × 3 × 5
121No: 11²
122No: 2 × 61
123No: 3 × 41
125No: 5³
126No: 2 × 3² × 7
127Yes
128No: 2⁷

FAQ

Is 111 a prime or composite number?

Number 111 is not a Prime

How many factors are in a number 111?

4

How to check if 111 is prime?

Divide 111 by the primes in order: 10² = 100 ≤ 111 < 121 = 11², so it is enough to try primes up to 10. The first one that divides it is 3: 111 ÷ 3 = 37, so 111 is composite.

See Also