Answer
1991 is not perfect because:
Related links:
- All calculations
- Is 1991 a composite number?
- Is 1991 an even number?
- Is 1991 an irrational number?
- Is 1991 an odd number?
- Is 1991 a perfect square?
- Is 1991 a prime number?
- Is 1991 a rational number?
- What are the factors of 1991?
- What are the multiples of 1991?
- What is the prime factorization of 1991?
