It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 401 648 491 is not a prime number.
For example, 401 648 491 can be divided by 71: 401 648 491 / 71 = 5 657 021.
For 401 648 491 to be a prime number, it would have been required that 401 648 491 has only two divisors, i.e., itself and 1.
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401 648 491 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 401 648 491 is about 20 041.170.
Thus, the square root of 401 648 491 is not an integer, and therefore 401 648 491 is not a square number.
The square of a number (here 401 648 491) is the result of the product of this number (401 648 491) by itself (i.e., 401 648 491 × 401 648 491); the square of 401 648 491 is sometimes called "raising 401 648 491 to the power 2", or "401 648 491 squared".
The square of 401 648 491 is 161 321 510 322 577 088 because 401 648 491 × 401 648 491 = 401 648 4912 = 161 321 510 322 577 088.
As a consequence, 401 648 491 is the square root of 161 321 510 322 577 088.
401 648 491 is a number with 9 digits.
The multiples of 401 648 491 are all integers evenly divisible by 401 648 491, that is all numbers such that the remainder of the division by 401 648 491 is zero. There are infinitely many multiples of 401 648 491. The smallest multiples of 401 648 491 are: