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4 is the first number to be [[a ]]semiprime number]]. The next is 6.
 
4 is the first number to be [[a ]]semiprime number]]. The next is 6.
   
4 is associated with bad luck in Eastern numerology because the Chinese word for "four" sounds similar to the word for "death."
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== In googology ==
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In Greek-based number-naming systems, 4 is associated with prefix "'''tetra-'''", and with prefix "'''quad-'''" in Latin systems.
   
It is possible to test for divisibility by 4 in base 10 by looking at last 2 digits of the number. If the 2-digit number is divisible by 4, then the whole number is.
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4 can be named "'''fztwo'''", "'''fugatwo'''", "'''megafugatwo'''", "'''boogatwo'''", "'''twoplaton'''", "'''gartwo'''", "'''bartwo'''", "'''trartwo'''", "'''quadrartwo'''", "'''quintartwo'''", "'''sextartwo'''", "'''septartwo'''", "'''octartwo'''", "'''nonartwo'''".
 
Ignoring weekdays, the Julian calendar repeats every '''4''' years.
 
 
Its Roman numeral is most commonly IV, but on clock faces, IIII is also used.
 
 
== In [[googology]] ==
 
 
Some googologisms based on 4 are [[supertet]], [[quadroogol]] and [[googolquadriplex]]. 4 can be thought as [[zero]]th term of sequence defining Graham's number: \(g_0\) = 4. 
 
 
In Greek-based number naming systems, 4 is associated with prefix tetra-, and with prefix quad- in Latin systems.
 
 
4 can be named gartwo, fztwo, fugatwo, megafugatwo, boogatwo, or twoplaton with the [[gar-]], [[fz-]], [[fuga-]], [[megafuga-]], [[booga-]], and [[-platon]] prefixes respectively.
 
   
 
Testing if a number is a multiple of 4 can be done by seeing if the last two digits make a multiple of 4. So 57368 is a multiple of 4 since 68 = 4*17.
 
Testing if a number is a multiple of 4 can be done by seeing if the last two digits make a multiple of 4. So 57368 is a multiple of 4 since 68 = 4*17.
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