It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 166 813 is not a prime number.
For example, 42 166 813 can be divided by 13: 42 166 813 / 13 = 3 243 601.
For 42 166 813 to be a prime number, it would have been required that 42 166 813 has only two divisors, i.e., itself and 1.
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42 166 813 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 42 166 813 is about 6 493.598.
Thus, the square root of 42 166 813 is not an integer, and therefore 42 166 813 is not a square number.
The square of a number (here 42 166 813) is the result of the product of this number (42 166 813) by itself (i.e., 42 166 813 × 42 166 813); the square of 42 166 813 is sometimes called "raising 42 166 813 to the power 2", or "42 166 813 squared".
The square of 42 166 813 is 1 778 040 118 576 969 because 42 166 813 × 42 166 813 = 42 166 8132 = 1 778 040 118 576 969.
As a consequence, 42 166 813 is the square root of 1 778 040 118 576 969.
42 166 813 is a number with 8 digits.
The multiples of 42 166 813 are all integers evenly divisible by 42 166 813, that is all numbers such that the remainder of the division by 42 166 813 is zero. There are infinitely many multiples of 42 166 813. The smallest multiples of 42 166 813 are: