It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 008 491 is not a prime number.
For example, 42 008 491 can be divided by 7: 42 008 491 / 7 = 6 001 213.
For 42 008 491 to be a prime number, it would have been required that 42 008 491 has only two divisors, i.e., itself and 1.
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42 008 491 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 42 008 491 is about 6 481.396.
Thus, the square root of 42 008 491 is not an integer, and therefore 42 008 491 is not a square number.
The square of a number (here 42 008 491) is the result of the product of this number (42 008 491) by itself (i.e., 42 008 491 × 42 008 491); the square of 42 008 491 is sometimes called "raising 42 008 491 to the power 2", or "42 008 491 squared".
The square of 42 008 491 is 1 764 713 316 097 081 because 42 008 491 × 42 008 491 = 42 008 4912 = 1 764 713 316 097 081.
As a consequence, 42 008 491 is the square root of 1 764 713 316 097 081.
42 008 491 is a number with 8 digits.
The multiples of 42 008 491 are all integers evenly divisible by 42 008 491, that is all numbers such that the remainder of the division by 42 008 491 is zero. There are infinitely many multiples of 42 008 491. The smallest multiples of 42 008 491 are: