Published on Nov 8, 2019

4 Number Background Images

License Info: Creative Commons 4.0 BY-NC

4 (four) is a number, numeral, and glyph. It is the natural number following 3 and preceding 5.

Four is the smallest composite number, its proper divisors being 1 and 2.

4 is the smallest squared prime (p2) and the only even number in this form. 4 is also the only square one more than a prime number.


A number is a multiple of 4 if its last two digits are a multiple of 4. For example, 1092 is a multiple of 4 because 92 = 4 × 23.

A four-sided plane figure is a quadrilateral (quadrangle) which include kites, rhombi, rectangles and squares, sometimes also called a tetragon. A circle divided by 4 makes right angles and four quadrants. Because of it, four (4) is the base number of the plane (mathematics). Four cardinal directions, four seasons, the duodecimal system, and the vigesimal system are based on four.

A solid figure with four faces as well as four vertices is a tetrahedron, and 4 is the smallest possible number of faces (as well as vertices) of a polyhedron. The regular tetrahedron is the simplest Platonic solid. A tetrahedron, which can also be called a 3-simplex, has four triangular faces and four vertices. It is the only self-dual regular polyhedron.

Lucky Number 4

People with the lucky number 4 are usually endowed with excellent management capability. They are good at summarizing scattered documents, making complicated situations simple and clearly handling problems. Since most of them lack the sense of security, they pursue the steady relationship to make themselves feel being protected.

Besides, these people fear or hate changes in life and they are the most stubborn compared with people having other lucky numbers. Though they may have realized their own weakness, they hardly want to change themselves. What’s more, they are good arguers upon some conflicts or arguments especially when they stand on a reasonable side, so give up the idea to dispute with them or persuade them.

Strong Points

They are patient, reliable and self-composed in the daily life which makes them good executants or ministrants. Generally speaking, they are proud, but not arrogant; conservative, but not stereotyped. Diligence, loyalty and realism are their strength. Apart from that, they are always ambitious and determined. No wonder that they are usually able to make great achievements.

Weak Points

Stubbornness is the most distinctive characteristic for those who have the lucky number 4. They are jealous, quarrelsome and sometimes boring. Although they usually are able to defeat others in the arguments with some surprising words or logicality, they actually lack imagination. Moreover, most of them may be a little tightfisted.

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