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4 (number) Facts for Kids. Kiddle Encyclopedia.
This page is about the number four. For the year, see 4



Cardinal  four  
Ordinal  4th (fourth) 

Numeral system  quaternary  
Factorization  2^{2}  
Divisors  1, 2, 4  
Roman numeral  IV  
Roman numeral (unicode)  Ⅳ, ⅳ  
Greek prefix  tetra  
Latin prefix  quadri/quadr  
Binary  100_{2}  
Ternary  11_{3}  
Quaternary  10_{4}  
Quinary  4_{5}  
Senary  4_{6}  
Octal  4_{8}  
Duodecimal  4_{12}  
Hexadecimal  4_{16}  
Vigesimal  4_{20}  
Base 36  4_{36}  
Greek  δ (or Δ)  
Arabic  ٤,4  
Persian  ۴  
Urdu  
Ge'ez  ፬  
Bengali  ৪  
Chinese numeral  四，亖，肆  
Korean  넷,사  
Devanagari  ४  
Telugu  ౪  
Malayalam  ൪  
Tamil  ௪  
Hebrew  ארבע (Arba, pronounced ARbah) or ד (Dalet, 4th letter of the Hebrew alphabet)  
Khmer  ៤  
Thai  ๔  
Kannada  ४ 
The number four is a number and a numeral. It comes after the number three, and before the number five. In Roman numerals, it is IV.
Mathematics
In mathematics, the number four is an even number and the smallest composite number. Four is also the second square number after one. A small minority of people have four fingers and four toes, on each hand and foot, respectively. This proves difficult to count on your fingers. Four squared is 16, and four doubled is 8.