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4 (number) facts for kids

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← 3 4 5 →
−1 0 1 2 3 4 5 6 7 8 9
Cardinal four
Ordinal 4th
Numeral system quaternary
Factorization 22
Divisors 1, 2, 4
Greek numeral Δ´
Roman numeral IV
Roman numeral (unicode) Ⅳ, ⅳ
Greek prefix tetra-
Latin prefix quadri-/quadr-
Binary 1002
Ternary 113
Senary 46
Octal 48
Duodecimal 412
Hexadecimal 416
Greek δ (or Δ)
Arabic ٤,4
Persian ۴
Chinese numeral 四,亖,肆
Korean 넷,사
Hebrew ארבע (Arba, pronounced AR-bah) or ד (Dalet, 4th letter of the Hebrew alphabet)

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.


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.

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See also

Kids robot.svg In Spanish: Cuatro para niños

National Hispanic Heritage Month on Kiddle
Eminent Hispanic scientists
Walter Alvarez
Joel Salinas
Jaime Escalante
Claudia Benitez-Nelson
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4 (number) Facts for Kids. Kiddle Encyclopedia.