# What is the square root of 66?

## Table with square numbers & square roots up to 100

**In this article, we'll cover the square numbers. We explain to you what is meant by a square number and provide you with suitable examples. The article deals with general math.**

Put simply, the square number is the multiplication of a natural number by itself.

To define a natural number, here is a brief definition.

All numbers used in counting are natural numbers, i.e. 1, 2, 3, 4, 5, etc.

Depending on the definition, the 0 belongs to it or is left out.

Negative numbers are never natural numbers.

### First square numbers

For a better understanding of learning and for quick reference, you will find the first square numbers and their calculation in the following list.

- 1
^{.}1 = 1 - 2
^{.}2 = 4 - 3
^{.}3 = 9 - 4
^{.}4 = 16 - 5
^{.}5 = 25 - 6
^{.}6 = 36 - 7
^{.}7 = 49 - 8
^{.}8 = 64 - 9
^{.}9 = 81 - 10
^{.}10 = 100

### Table with square numbers & square roots

number | Square number | square root |

1 | 1 | 1,000 |

2 | 4 | 1,414 |

3 | 9 | 1,732 |

4 | 16 | 2,000 |

5 | 25 | 2,236 |

6 | 36 | 2,449 |

7 | 49 | 2,646 |

8 | 64 | 2,828 |

9 | 81 | 3,000 |

10 | 100 | 3,162 |

11 | 121 | 3,317 |

12 | 144 | 3,464 |

13 | 169 | 3,606 |

14 | 196 | 3,742 |

15 | 225 | 3,873 |

16 | 256 | 4,000 |

17 | 289 | 4,123 |

18 | 324 | 4,243 |

19 | 361 | 4,359 |

20 | 400 | 4,472 |

21 | 441 | 4,583 |

22 | 484 | 4,690 |

23 | 529 | 4,796 |

24 | 576 | 4,899 |

25 | 625 | 5,000 |

26 | 676 | 5,099 |

27 | 729 | 5,196 |

28 | 784 | 5,292 |

29 | 841 | 5,385 |

30 | 900 | 5,477 |

31 | 961 | 5,568 |

32 | 1024 | 5,657 |

33 | 1089 | 5,745 |

34 | 1156 | 5,831 |

35 | 1225 | 5,916 |

36 | 1296 | 6,000 |

37 | 1369 | 6,083 |

38 | 1444 | 6,164 |

39 | 1521 | 6,245 |

40 | 1600 | 6,325 |

41 | 1681 | 6,403 |

42 | 1764 | 6,481 |

43 | 1849 | 6,557 |

44 | 1936 | 6,633 |

45 | 2025 | 6,708 |

46 | 2116 | 6,782 |

47 | 2209 | 6,856 |

48 | 2304 | 6,928 |

49 | 2401 | 7,000 |

50 | 2500 | 7,071 |

51 | 2601 | 7,141 |

52 | 2704 | 7,211 |

53 | 2809 | 7,280 |

54 | 2916 | 7,348 |

55 | 3025 | 7,416 |

56 | 3136 | 7,483 |

57 | 3249 | 7,550 |

58 | 3364 | 7,616 |

59 | 3481 | 7,681 |

60 | 3600 | 7,746 |

61 | 3721 | 7,810 |

62 | 3844 | 7,874 |

63 | 3969 | 7,937 |

64 | 4096 | 8,000 |

65 | 4225 | 8,062 |

66 | 4356 | 8,124 |

67 | 4489 | 8,185 |

68 | 4624 | 8,246 |

69 | 4761 | 8,307 |

70 | 4900 | 8,367 |

71 | 5041 | 8,426 |

72 | 5184 | 8,485 |

73 | 5329 | 8.544 |

74 | 5476 | 8,602 |

75 | 5625 | 8,660 |

76 | 5776 | 8,718 |

77 | 5929 | 8,775 |

78 | 6084 | 8,832 |

79 | 6241 | 8,888 |

80 | 6400 | 8,944 |

81 | 6561 | 9,000 |

82 | 6724 | 9,055 |

83 | 6889 | 9,110 |

84 | 7056 | 9,165 |

85 | 7225 | 9,220 |

86 | 7396 | 9,274 |

87 | 7569 | 9,327 |

88 | 7744 | 9,381 |

89 | 7921 | 9,434 |

90 | 8100 | 9,487 |

91 | 8281 | 9,539 |

92 | 8464 | 9,592 |

93 | 8649 | 9,644 |

94 | 8836 | 9,695 |

95 | 9025 | 9,747 |

96 | 9216 | 9,798 |

97 | 9409 | 9,849 |

98 | 9604 | 9,899 |

99 | 9801 | 9,950 |

100 | 10000 | 10,000 |

Note: The square roots are rounded to the 3rd decimal place.

### Online square root calculator

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