Compare 4 vs 5

Property	4	5
Type	semiprime	prime
Unique factors	1	1
Total factors	2	1
Prime factorization	2²	5¹
Prime factorization	2 × 2	5
Divisors count	3	2
Divisors	1, 2, 4	1, 5
Number of properties	1	36
Additive primes		3rd
Bell primes		2nd
Centered square primes		1st
Chen primes		3rd
Class 1+ primes		3rd
Dihedral primes		2nd
Factorial primes		3rd
Fermat primes		2nd
Fibonacci primes		3rd
Good primes		1st
Harmonic primes		1st
Left-truncatable primes		3rd
Multiplicative primes		3rd
Palindromic primes		3rd
Pierpont primes		3rd
Pierpont primes of the 2nd kind		3rd
Primes		3rd
Prime quadruplets (1st member)		1st
Prime quintuplet 2s (1st member)		1st
Prime triplets (1st member)		1st
Proth primes		2nd
Pythagorean primes		1st
Restricted left-truncatable primes		2nd
Right-truncatable primes		3rd
Safe primes		1st
Semiprimes	1st
Sexy primes (1st member)		1st
Sexy prime quadrupletss (1st member)		1st
Sexy prime triplets (1st member)		1st
Solinas primes		2nd
Sophie germain primes		3rd
Super primes		2nd
Thabit primes		2nd
Twin primes (1st member)		2nd
Twin primes (2nd member)		1st
Two-sided primes		3rd
Wilson primes		1st
Roman numberals	IV	V
Base 2	100₂	101₂
Base 3	11₃	12₃
Base 4	10₄	11₄
Base 5	4₅	10₅
Base 6	4₆	5₆
Base 7	4₇	5₇
Base 8	4₈	5₈
Base 9	4₉	5₉
Base 10	4₁₀	5₁₀
Base 11	4₁₁	5₁₁
Base 12	4₁₂	5₁₂
Base 13	4₁₃	5₁₃
Base 14	4₁₄	5₁₄
Base 15	4₁₅	5₁₅
Base 16	4₁₆	5₁₆